求助GWD 感觉此题有争议

hukai901

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

答案选C。但是感觉句式很奇怪，且that 用法不知道对不对。。我觉得D较好，应该down可以做动词吧？不太确定。。

Kb24

答案是D啊LZ是对的