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The error is in part 'B' and 'D' of the sentence. In part 'B' use of 'have'(plural auxiliary verb) is incorrect and needs to be replaced by singular auxiliary verb 'has'( in 'have revolutionised') as the sentence talks about a single approach. In option 'D' use of 'relevantly more' is contextually incorrect and needs to be replaced by 'more relevant' which suggests that field-work based approach has made economics more relevant in policy making. Hence, the answer is option b).
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Cours...