GMAT Sentence Correction (SC) | Re: Although some officials noted that using machines for

Although some officials noted that using machines for farming in China costs more than traditional hand cultivation, themechanization of farming in the village of Long Bow doubled the corn yield while the previous year’s costs were cut in half.

(A) mechanization of farming in the village of Long Bow doubled the corn yield while the previous year’s costs were cut in half
--> active voice is preferred to passive voice.

(B) mechanization of farming in the village of Long Bow doubled the
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