5. 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
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
Parallelism: The rate in the 1980's and the rate (referred by it in what it was construction) should be parallel. Alternatively, the sentence can be rephrased as: The increase of xxx in the 1980's was nearly twice as fast as that in the 1970's.