This sentence contains an error in the usage of the superlative. Specifically, superlatives are formed either by adding -est to the end of an adjective, or adding the word most before it; both options cannot be used together. The correct choice is, "tallest."

This sentence contains an error in the usage of the superlative. The word "than" indicates that a comparison is occurring in the sentence; therefore, a comparative adjective is necessary. The correct form is "larger." Note that the comparative adjective form in English is formed by either adding -er to the end or more to the beginning of the word. Using both is unacceptable. The correct choice is, "a book larger than his last one."

The use of "they're" is incorrect in the sentence. "They're" is a contraction for "they are," while the sentence needs the third person plural possessive pronoun, "their." "Fewer people threw their support" is the correct answer choice.

The central issue here is the incorrect superlative "most happy". The correct superlative is happiest. All of the syntactic modifications in the other answer choices either create agreement issues or simply fail to resolve the central issue.

This sentence uses the wrong form of "grateful." The correct comparative form of "grateful" is "more grateful. "Gratefulled" is not a word and "gratefully" is an adverb, meaning it describes adjectives and verbs, not nouns (i.e. Hank). The correct choice is "more grateful."

This sentence does not use the correct form of the word "great." It is clear from the context of the sentence that the superlative form is necessary, which could either be "greatest" or "most great." The former is the only available choice, however. The correct choice is, "considered his students the greatest." It is not necessary to add a noun after "greatest" as the adjective can be used as a substantive (to take the place of a noun, implying "greatest (students)").

Since there are eight schools in the Ivy League, the superlative comparison "best" is necessary in this sentence. "Best" would only be correct if Bale were being compared to one other school.

The prepositional phrase "for special needs children" is awkwardly appended to the end of the sentence, making it read as though the subjects "hometown" was "for special needs children," rather than her teaching. The phrase should be moved closer to the mentioning of her career as a teacher, which is only done in the answer choice "she was a schoolteacher for special needs children at a public elementary school in her hometown."

The use of the preposition "for" in this sentence is incorrect, as it is not the common preposition matched with disapproval. The commonly used word is "of," which more properly conveys the connection to disapproval. The only answer choice which makes this change is "they had shown strong disapproval of her choice."

The use of the preposition "since" in this sentence is incorrect, as "since" must only be used to indicate a specific length of time. Because the sentence only indicates a general length of time, the proper preposition is "for." As the only choice to use the right word, the correct answer choice is "but has not been arrested for a long time."