GMAT Sentence Correction (SC) | Neuroscientists distinguish

Hydrocarbons, with which fruit flies perfume themselves in species-specific blends, are known to be important in courtship,and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of others.

A. and apparentlythis assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of
Which apparently assist -> Hydrocarbons or the fact that HC are known to be important in courtship.
In both
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