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I thought that GMAT does not test commas, colons, semi-colons, etc?
Rehash your thinking. GMAT often tests our understanding of such punctuation, especially within the context of succinct grammar.
This is a listing SC, so correct comma use is imperative. Agree with (C)
According to MGMAT, the GMAT does not test commas. They do however test semi-colon, colon, and the dash.
I beg to differ. Read this info from testmagic and sentencecorrection.com:
That vs. Which
1. A testmagic tip: GMAT almost always (I say almost always because I've seen two questions that did not follow this rule, but the rule was violated in all five answer choices) wants you to put a comma before which. In other words, if you see which without a comma before it, it's probably wrong.
If the person you're talking to, or the person who's reading what you've written, needs that extra bit of information to know which noun you're referring to, we say that that extra information is non-restrictive. This word doesn't really describe the function clearly, so many teachers say that this information is â€œextra."
On the other hand, if you need that information to know which noun you are talking about, we say that the information is restrictive. Again, this word is not really a good choice for clarity, and many teachers use the term "necessary information" instead
We need a comma before non-restrictive clauses and phrases but it is not needed before restrictive clauses and phrases.
Both the sentences below are correct according to GMAT, but have different meanings.
â€¢ Please go into the room and get me the big book, which is mine. (Ex: of non-restrictive)
â€¢ Please go into the room and get me the big book that is mine. (Ex: of restrictive)
http://www.sentencecorrection.com/forum ... wtopic=150
Also, the correct positioning of commas are often tested on modifier and listing SCs.