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For the first time in the modern era, non-Hispanic Whites are officially a minority in California, which amounts to a little less than half the population of the state, down from nearly there-quarters only a decade ago.

A. which amounts to a little less than half the population of the state, down from nearly three-quarters only a decade ago

B. which amounts to a little less than half the population of the state, down from a decade ago, when it was nearly three-quarters

C. and that amounts to a little less than half the population of the state, down from a decade ago, when they were nearly three-quarters

D. amounting to a little less than half the population of the state, down from nearly three-quarters a decade ago

E. amounting to a little less than half the population of the state, down from what it was a decade ago by nearly three-quarters

以下是引用ontheway1955在2008-10-29 10:43:00的发言：

A. which amounts to a little less than half the population of the state, down from nearly three-quarters only a decade ago

B. which amounts to a little less than half the population of the state, down from a decade ago, when it was nearly three-quarters

C. and that amounts to a little less than half the population of the state, down from a decade ago, when they were nearly three-quarters

D. amounting to a little less than half the population of the state, down from nearly three-quarters a decade ago

E. amounting to a little less than half the population of the state, down from what it was a decade ago by nearly three-quarters

answer is D why C?

thank you!