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Black-and-white movies are as visually impressive than full-color movies are as creating interesting imagery depends mostly on whether the director has a deep understanding of cinematography.
This answer choice is illogical and grammatically incorrect. As cannot be complemented by than because as indicates a similarity or equality between the two things compared whereas than indicates a difference between them.
What helps us identify this question as a Comparative question as well as identify the mistake is the following Stop Sign:
Like, unlike, than, as
Although this answer choice corrects the original Comparative mistake by replacing than with as, it is stylistically flawed as it omits the verb are from the second half of the Comparative structure.
Since there's another answer choice that corrects the original mistake but preserves the verb are, it is preferable to this one. Look for it!
This answer choice correctly complements as with as while preserving the conjugated verb are in the second half of the Comparative structure.
Although this answer choice corrects the original Comparative mistake by replacing than with as, in the GMAT, the word if is used in Conditionals only; if one thing, ...then something else. Since in this question there is no condition, if should be replaced by whether.
Whether is used as a choice between two possibilities dealing with the same subject or as a yes/no question.
Example: I do not know whether this will work. (yes or no)
He was not sure whether he wanted banana or chocolate cake. (a choice between 2 possibilities)
Although this answer choice corrects the original Comparative mistake by replacing than with as, the addition of the phrase or not at any point after the word whether is considered redundant.