E is fine. D contains 'as much as' ... 'as many as' would have been more appropriate. You use 'as much as' for uncountable nouns; for 'young adults' (countable), 'as many as' should have been used.
1. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.
(A) doubling those reported in the 1977 survey
(B) to double the number the 1977 survey reported
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey
oa - E, can't find any fault with D. The antecedent of those is young adults, isn't it?
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