prep一道迷惑惑的题

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
答案是d，但是谁能告诉我a有什么错吖？

amounting 和 representing看上去很对称，但是现在分词引导的从句它的逻辑主语是one automobile manufactuer，在

逻辑上不合理阿！

D是一个名词从句