Question

The creation of a single European market in financial services was a hard row to crack , but it has been a resounding success.

In each question below, a sentence is given with a part of it printed in bold type. That part contains an idiom/phrasal verb that may be correct or erroneous. Each sentence is followed by phrases (A), (B), (C) and (D). Find out which is the correct idiom that should replace the error in bold, if there is any, and which makes the sentence grammatically meaningful and correct. If the sentence is correct as it is and ‘No improvement required’, mark (E) as the answer.
A big row to crack
B hard break to crack
C hard nest to crack
D hard nut to crack
E No improvement required
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