Which of the phrases at (a), (b),(c)and (d) given below should replace the phrase given in bold in the following sentence 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.
From the context, we can infer that the phrase indicates causality between overstaffing and low productivity. Hence, the correct phrasal verb to use in this case is 'led to'. As the event has already occurred, the correct tense to use would be the past tense. The phrase is part of the subordinate clause and hence should begin with "which". Hence, option D.
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