Question

Although I had studied diligently for weeks, the challenging final exam proved on be more difficult than I had anticipated, and I ultimately received a lower grade than I had hoped for.

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 1), 2), 3) and 4). 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 5) as the answer.
A Proved to more difficult
B Proved to the more difficult
C Proved to be more difficult
D Proved to more difficult
E No correction is required
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