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XDF兰皮书的一道78页10题

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

A

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

答案是D，为什么不能选A，amounting不是优先指代Caliornia?

In A, which refers to an unclear referent.

amounting refers to the subject, non-Hispanic whites.