GMAT Sentence Correction (SC) | Re: Q39: Whereas in mammals the tiny tubes that convey

Just about parallelism.

A. Whereasin mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines,in birds the tubes
B. Whereasthe tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines,birds have tubes that
C. Unlikemammals , where the tiny tubes for conveying nutrients to bone
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