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This is something that popped up in my mind when I was having a normal conversation other day. So, I don't really have a OA or OE. After thinking about this, I realized this concept gets tested a lot in GMAT. Here is my 2 cents. Please feel free to critique.
you apply parallel structure only to ensure flow of though among various phrases/clauses. Here in this case we are comparing two things in one phrase. Even though choice A is not gramatically wrong in real world, we can concisely express the same thought in choice B . Hence choice B is prefered in GMAT world.
Look at it this way:
more to do X than Y
structure here to follow is more ( verb/adjective/adverb) Noun than Noun. _________________
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