This is a relatively short GMAT sentence correction question. Part of the underlined portion fo the sentence mentions the word "like." Contrary to what you might expect, this question is actually not a "like" vs "as" question. You know that because none of the other answer choices mention "as" in the answer choice in place of the "like" word.
Attention should be drawn to the subject "pattern of whisker spots." Is this subject singular or plural? The word "pattern" by itself is singular but it is followed up with "whisker spots" - which is plural. How does this affect the type of verb that you use later in the sentence. Does that verb need to be singular or plural?
There is also an element of idiomatic phrasing in the sentence. You have phrases beginning with "since..." - but how should you position this part of the sentence in a way that makes the entire sentence flow?
Also answer choices presented have sentence portions that contain two commas. So you're going to need to pick a solution that would make the sentence a split sentence.
Remember to think smart on this question. Not that much time is needed on this GMAT sentence correction question -- that is, if you know what to look out for.
source: GMAT Pill*
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