请教prep2007-2,关于分词的~求指点~谢谢~

mousehyl777

请教prep2007-2

In the Louisiana Purchase of 1803, the United States acquired 828,000 square miles for about four
cents an acre, which more than doubled the country's size and that brought its western border
within reach of the Pacific Ocean.

(A) In the Louisiana Purchase of 1803, the United States acquired 828,000 square miles for about
four cents an acre, which more than doubled the country's size and that brought
(B) For about four cents an acre the United States acquired, in the Louisiana Purchase of 1803,
828,000 square miles, more than doubling the country's size and it brought
(C) With the Louisiana Purchase in 1803, the United States acquired 828,000 square miles for
about four cents an acre, more than doubling its size and bringing

答案是C，想问more than doubling its size and bringing不是应该修饰 828,000 square miles ，C不是就近修饰成 four cents an acre？？不懂……
我选的是B，答案说B的it指代不清，it不就是指US吗？为什么不清哦？

求大家指点~谢谢~

balapupu

我觉得这里more than doubling its size and bringing应该是分词短语做状语修饰整个主句吧。It 指代US逻辑意思不对了，应该是purchase 这件事使得其西边的领土更加辽阔，而不是US～