请教一个语法问题

56summer

GWD6-Q18:
In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.



 A. In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.

B. Of the Californians under the age of eighteen, today more than 43 percent of them are Hispanic, compared with a decade ago, when it was about 35 percent.
C. Today, more than 43 percent of Californians under the age of eighteen are Hispanic, compared with about 35 percent a decade ago.
D. Today, compared to a decade ago, Californians who are Hispanics under the age of eighteen account for more than 43 percent, whereas it was about 35 percent.


D. Today, compared to a decade ago, Californians who are Hispanics under the age of eighteen account for more than 43 percent, whereas it was about 35 percent.

E. Today, Hispanics under the age of eighteen in California account for more than 43 percent, unlike a decade ago, when it was about 35 percent.



请问一下C中的 compared with about 35 percent a decade ago 在句子里是做什么成分？

hikarugaara

我觉得就是分词成分修饰主句啊

56summer

那这里是一个比较结构，它是和主句中的什么成分相比较呢？

hikarugaara

more than 43 percent和35 percent比

56summer

可以就直接这样比吗?不用补出主语的别的成分吗？