请教大全上的一题，有关同位语

17tomato

Since 1981, when the farm depressionbegan, the number of acres overseen by professional farm-management companies havegrown from 48 million to nearly 59 million, an area that is about Colorado’ssize.
(A) have grownfrom 48 million to nearly 59 million, an area that is about Colorado’s size
(B) have grownfrom 48 million to nearly 59 million, about the size of Colorado
(C) has grown from48 million to nearly 59 million, an area about the size of Colorado

(D) has grown from 48 million up to nearly 59 million,an area about the size of Colorado’s

(E) has grown from 48 million up to nearly 59 million,about Colorado’s size
请问各位，C选项和D选项中的an area做谁的同位语？难道是the number吗？
每个选项的错误又在哪儿呢?
答案：

答案选c

a476772885

A 答案呢？感觉就是上面照抄下来的

jeffery2541

答案是C。

最后那个area结构的用法是这样的：有人把称为句末它独立词组，而语法笔记中叫做概括性同位语，也就是同位语的一种。其实不管怎么称呼，其用法实质都是一样的，即用一个概括性名词概括前句中某些内容，随后再有相应的限定成分来修饰这个概括性名词。这是GMAT语法题中很常见的一种结构用法。