Noam Chomsky proposed that we all are born with a "language acquisition device" in our minds, which gives us universal principles of human language. We learn our language's own "settings" for human communication according to these universal principles. For instance, if all human language has temporal tenses, we learn how our particular language expresses tense. Although the behaviorists believe we only learn language through our environment, Chomsky pointed out that we learn language very quickly through processes that appear similar to the human species, regardless of environment.

Semantics and syntax are fields of linguistics that concern different aspects of language. Syntax is primarily concerned with the universal properties and idiosyncrasies of the structure of language. For example, syntax studies how we construct our language an speech, and how we form certain phrases and clauses. Semantics is concerned with deciphering meaning in language by looking at its logical structure, the meaning of words, or how it is represented cognitively.   

Displacement is a unique property of human language. The only possible exception is in the case of bees, which may have a method of communicating directions to a plant they found. Other than this, we are unique in our ability to discuss events or objects that are not immediately apparent such as places far away, the past, and the future. Some have even theorized this was where the need for language began.

Syntax is primarily concerned with the ordering of words and phrases, and their respective grammatical functions. That said, it assists in conveying meaning but is not the singular mode to express meaning. For instance, independent of whether or not the word "cat" is ordered in a particular way in a sentence, we know the word refers to a small fluffy feline animal. This is semantics.

However, if we place "cat" at the beginning of the sentence—"the cat sniffed the pigeon"—we know the cat is performing the action of sniffing. But once we reverse the order so that the sentence is "the pigeon sniffed the cat," we know the cat is being sniffed by the pigeon. The order of the nouns, verbs, and objects is determined by the syntactic rules of a language thus assists in conveying meaning.

The "C" sound—represented phoenetically as [k], a voiced velar stop—is a phoneme of the English language. Phonemes are units of sound that can distinguish meaning in a language. Another example would be "G" and "B." Since "boat" and "goat" would sound exactly the same if it weren't for the first consonant, we know the first consonant is used to distinguish between the meaning of these two words. Therefore, we know that both "B" and "G" are phonemes of English.

At this particular stage of language acquisition, babies are transitioning away from babbling and beginning to develop communication using whole words. They can only say simple words and cannot combine them, even into simple commands, which is the next stage of acquisition.

Wernicke's area, located in the upper temporal lobe, contains motor neurons involved in the comprehension of speech. A person with a malfunctioning Wernicke's area will have difficulty understanding what others are saying. Broca's area is involved in producing speech, and none of the other answer choices are directly involved in speech-related processes.

Noam Chomsky's theory of language development suggests that children possess the inherent ability to acquire language. When exposed to any given language, children pick it up easily because they have a kind of "universal grammar" that allows them to understand the commonalities between all languages.

The correct answer is that children tend to overgeneralize grammatical rules after they first learn them-- a process unsurprisingly called overgeneralization.

As for the other answers, children understand language better than they can speak it (think about how your dog can understand some english but can't produce it), social interactions and innate biological ability play roles in acquiring language, and the language a child learns does impact their perception of the world according to Whorf's linguistic relativity hypothesis. 

In opposition to behaviorists such as B.F. Skinner, Noam Chomsky argued that humans are born with the ability to acquire language. He put forth the idea that all humans, regardless of socio-cultural differences, have the same naturally underlying language learning abilities.