Prep-152

哪位nn给解释下这道题？

152.
                Officials at the United States Mint believe that the Sacagawea dollar coin will be used more as a substitute for four quarters rather than for the dollar bill because its weight, only 8.1 grams, is far less than four quarters, which weigh 5.67 grams each.

A.      more as a substitute for four quarters rather than for the dollar bill because its weight, only 8.1 grams, is far less than

B.      more as a substitute for four quarters than the dollar bill because it weighs only 8.1 grams, far less than

C.      as a substitute for four quarters more than for the dollar bill because it weighs only 8.1 grams, far less than

D.     as a substitute for four quarters more than the dollar bill because its weight of only 8.1 grams is far lighter than it is for

E.      as a substitute more for four quarters rather than for the dollar bill because its weight, only 8.1 grams, is far less than it is for

没弄清楚考点在哪里。

LS的能分析一下句子结构和考点吗？我看的一头雾水。