In each question below, a sentence is given with a part of it printed in bold and underlined. 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. The panel of experts, after reviewing extensive evidence, were of the opinion that the proposal required revision.