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GMATNinja Thank you for your great replies above. Two quick follow up questions.

(1) I understand why B is incorrect (due to the if). However, if the last part of the sentence was corrected, are there any circumstances within which a double "whether" works? Or is the idiom always "whether x or y"

(2) Would option C be correct if the parallelism with "scaling" was fixed? It seems wordy and messy regardless.

Thank you!
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kelly_jacques
GMATNinja Thank you for your great replies above. Two quick follow up questions.

(1) I understand why B is incorrect (due to the if). However, if the last part of the sentence was corrected, are there any circumstances within which a double "whether" works? Or is the idiom always "whether x or y"

(2) Would option C be correct if the parallelism with "scaling" was fixed? It seems wordy and messy regardless.

Thank you!

Actually, choice (A) uses a "double whether" construction. It's the correct answer, so the construction must be OK.

Keep in mind that GMAT SC is about picking the BEST sentence out of the five available options, not labelling individual choices as wrong or right in a vacuum. That's why analyzing tweaked versions of the answer choices is rarely productive -- don't waste your valuable study time with hypothetical variations. :)

I hope that helps a bit!
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