语法大全199题的提问，感激不尽！

Idontcare4u

199. Car owners who inflate their tires properly can substantially boost their vehicles’ fuel efficiency, since the increase in car-road friction can waste up to five percent of car fuel by underinflation.
(A) Car owners who inflate their tires properly can substantially boost their vehicles’ fuel efficiency, since the increase in car-road friction can waste up to five percent of car fuel by underinflation.
(B) Because the underinflation of tires can waste up to five percent of a car’s fuel by increasing car-road friction, car owners can substantially boost their vehicles’ fuel efficiency by properly inflating the tires.
(C) Their vehicles’ fuel efficiency is substantially boosted by car owners through the proper inflation of tires that, when underinflated, can waste up to five percent of car fuel by an increase in car-road friction.
(D) The proper inflation of tires by car owners, due to the fact that underinflation can waste up to five percent of a car’s fuel by the increase of car-road friction, can substantially boost their fuel efficiency.
(E) Because up to five percent of a car’s fuel are wasted through the increases in car-road friction when the tires are underinflated, car owners properly inflating tires can substantially boost their fuel efficiency.

正确答案是B，大全解释只说了B为什么对。
但是我觉得AE也没什么错误啊？请问谁能帮忙指教一二？

我心匪席

个人理解：
A 最后by underinflation的主语应该是人而不是the increase吧
E 的逻辑意思是所有车子的5%的油耗都归因于轮胎气不足导致的磨损，但是原句应该没有这个意思吧。。。。

Idontcare4u

认同E的解释……呃，但是我觉得A这错误有点牵强，毕竟car owners才是句子的主语，tires只不过是定语从句中的一部分。。。

anitawin

E中用car owners properly inflating tires作主语（這種sb. doing的結構相對于B來說沒有那麼簡潔 也就是我們長說的concision啦！）
A我感覺car owners who inflate their tires中的their指代有問題 應該是car的tires哇~不曉得有沒有在钻牛角尖

Idontcare4u

大全解释：B is best.
用because表原因，用两个by doing表方式, 句子结构平行, 句意表达最清楚。
我知道C错在将主动句改成了被动句。
D错在了;之前的句子不完整
但是我觉得AE也都用了，because说的也挺对的呀！