For this question, the answer choice that best completes the sentence is B, "was time we do away with JAMB."

The sentence refers to a suggestion or proposal made by "the lazy candidate". 

The tense of the main clause ("the lazy candidate suggested") indicates this occurred at some point in the past. 

The subordinate clause that follows must also be in the past tense to concord (agree) with the main clause

Of the options given, A, C, and E do not match the past tense of "suggested".

D correctly uses the past tense "did" but "did away" is not the appropriate phrasing here. 

Only B uses the past tense "was" along with "do away," which fits the structure of a suggestion being made in the past

Concordance of tense between the main and subordinate clauses is important for grammatical correctness. 

"Was time" paired with "do away" best achieves this while completing the meaning and staying faithful to the context.