Hey guys,
You're both right...but I definitely wouldn't call this an idiom problem. Word to the wise - the less you use the word "idiom" in your thought process, the better you'll do. By nature, idioms are one-time rules. It's that way because that's the way it is. Whereas the more systematic rules will help you in multiple situations.
Here, the supernova isn't the category...it's "of" a category (it belongs to a category). So Only C and E need apply - A, B, and D are immediately out.
In choice C, the pronoun "it" is redundant - you already have the pronoun "one" to start the sentence, so the introduction of the second pronoun is unnecessary and potentially confusing. All that's left is E.
My suggestion - as you study and jot down notes on why you eliminate answer choices, if you notice that you're using the word "idiom" in more than 10% of your answer choices (and even that's pretty high), go back and try to find more systematic reasons (modifiers, pronouns) so that you can train yourself to think that way. It's much easier to get really good at 8-10 systematic error categories than it is to become great at the thousands of idioms that you could theoretically use on this test.
Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep
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