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indicates requires a 'that' after it .. so A and B are wrong.... c is not clearly worded..... only D and E are close.. however D contains 'have significantly..... and are not making...' where the 2nd part contains 2 verbs 'have are not making... so 'E' is the ans
Between D & E, main doubt I have is to choose between "or" clause & "and" clause. Reading the sentence, I find "or" clause to be inserted as the sentence indidcates one of the activities done by few people to overcome increase in energy prices.