When "neither" is used in a sentence, "nor" should follow it, creating the structure "neither X nor Y," where X and Y are items formatted in the same manner. To correct the sentence, we need to change "and definitely not" to "nor." Several answer choices do this: "nor faithful to the original film," "nor were it faithful to the original film," and "nor was it faithful to the original film." "Nor were it faithful to the original film" and "nor was it faithful to the original film" might each look like potentially correct answers, but each introduces a verb that disrupts the parallel structure of "neither X nor Y," in which "nor" should be immediately followed by "faithful to the original film." The correct answer is thus "nor faithful to the original film," making the corrected sentence, "The remake of the film was neither enjoyable nor faithful to the original film."

The best way to rephrase "help treat, but even help prevent, most psychological disorders" is "help treat and even prevent most psychological disorders." Commas can be used to denote an interrupting phrase, which is an idea connected to the main idea but not necessary to the understanding of the main idea of the sentence. For example, an interrupting clause may provide additional information about the main idea or a qualification (using "but" or "however"). In this example, the idea that psychotherapy can help prevent psychological disorders is part of the main idea of the sentence, so it does not have to be separated from the remainder of the sentence by commas.

The correct form for this sentence is "neither . . . nor." In addition, "neither . . .nor" leads to use of the singular form "is" rather than "are."

The comma is excessive and causes problems with the logic of the sentence. “Which” usually requires a comma before it and follows a fact, assertion, or statement. The sentence's use of "which" doesn't come after a comma, so it should be changed to "that."

This sentence requires use of “that” because the United States is a country (e.g., a noun). Also, “British” must be capitalized because it is a nationality. 

The sentence is trying to explain that in spite of the giant squid's elusiveness, scientists are finding new ways of studying it. The sentence therefore is trying to contrast two ideas, as opposed to showing causation with the word "because." The only answer choice that uses a contrasting conjunction is "Although," so it is the correct answer.

The underlined phrase, a separate clause further explaining the first half of the sentence, does not work as a complet sentence. In order to appropriately fit after "because," the phrase needs to be turned into a complete thought. "Because they had exorbitant costs" is the best choice among the answers.

This sentence contains an error in its logic of cause and effect. The first part of the sentence is the reason for the advice offered in the second part. So, you should change "and" to a word that demonstrates the cause-and-effect relationship. Do not add a contrast word like "but" or "although" unless the sentence includes some sort of contradiction or opposition.

The original text contains a faulty compaison. It compares portraits painted during the Renaissance to the time period of the Middle Ages. Instead, portraits should be compared to other portraits. The only answer choice that correcly makes this comparison is "reveal a stricter adherence to the principles of realism than those painted during the Middle Ages."

The original sentence does not follow employ parallel structure within the list of things that the composer does every morning. To make it consistent, each verb should be an infinitive ("to make . . . sit . . . begin"). None of the other answers fit into that pattern.