GMAT Sentence Correction (SC) | Re: Unlike Colombian coffee, which is generally harvested by hand

A. Unlike Colombian coffee, which is generally harvested by hand and immediately threshed, much of that harvested in Brazil is different, as it is mechanically done, and not threshed until after drying.

B. Whereas in Colombia coffee is generally harvested by hand and then immediately threshed, in Brazil much of the coffee is mechanically harvested and is dried before it is threshed.

C. In comparison with Colombian coffee, which is generally hand harvested and then threshed immediately, in Brazil
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