[求助] Prep 164

164.
            (33751-!-item-!-188;#058&007036)

One automobile manufacturer has announced plans to increase the average fuel efficiency of its sport utility vehicles by 25 percent over the next five years, amounting to roughly five miles per gallon, and representing the first significant change in the fuel efficiency of any class of passenger vehicle in almost two decades.

(A) amounting to roughly five miles per gallon, and representing

(B) amounting to roughly five miles per gallon, and it would represent

(C) an increase that would amount to roughly five miles per gallon and it would represent

(D) an increase that would amount to roughly five miles per gallon and would represent

(E) which is an increase amounting to roughly five miles per gallon, representing

为什么B部队呢？

求教！

it指代不明

amounting to没见过这样的用法

amounting to的逻辑主语本应是increase,在这里很不明确,容易造成歧义,所以用一个同位语会比较清晰;

同时,B答案是想用it来指代increase,可是指代很模糊.