17. In the 1980's the rate of increase of the minority population of the United States was nearly

twice as fast as the 1970's.

A. twice as fast as

B. twice as fast as it was in

C. twice what it was in

D. two times faster than that of

E. two times greater than

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i went for B. but it's wrong

it=the rate of increase of the minority popylation of the United States

was (in the 1980's) ~ was ( in the 1970's)

i can find examples of "twice as many as" and "twice as much as" in og #156 and #168.

but is it okay to say "twice as fast as"?

and what does "what" mean in choice C?

Thank you!