After each of the following sentences, a list of possible interpretations of the sentence is given. Choose the interpretation that you consider most appropriate for each sentence.
Constructing the road along the coast was difficult but the men had already broken the back of the work before the rains. This means that they had

A. completed the preparations
B. completed the most difficult part of it  
C. completed it altogether
D. broken the road

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Correct Answer: B