Question

Scientists are learning more about how diabetes affect the cardiovascular, renal, nervous, and ophthalmological systems.

Directions: In each question below, a sentence is given with a part of it printed in bold type. That part may contain a grammatical error. Each sentence is followed by phrases (A), (B), (C) and (D). Find out which phrase should replace the phrase given in bold to correct the error, if there is any, and to make the sentence grammatically meaningful and correct. If the sentence is correct as it is and ‘No correction is required’ , mark (E) as the answer.
A Scientists is learning more about how diabetes affects
B Scientist are learning more about how diabetes affects
C Scientist are learning more about how diabetes affect
D Scientists are learning more about how diabetes affects
E No correction is required
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