大全199求指导，关于because和since

1.       Car owners who inflate theirtires properly can substantially boost their vehicles’ fuel efficiency, sincethe increase in car-road friction can waste up to five percent of car fuel by underinflation.

(A) Car owners whoinflate their tires properly can substantially boost their vehicles’ fuelefficiency, since the increase in car-road friction can waste up to fivepercent of car fuel by underinflation.

(B) Because theunderinflation of tires can waste up to five percent of a car’s fuel byincreasing car-road friction, car owners can substantially boost theirvehicles’ fuel efficiency by properly inflating the tires.

(C) Theirvehicles’ fuel efficiency is substantially boosted by car owners through theproper inflation of tires that, when underinflated, can waste up to fivepercent of car fuel by an increase in car-road friction.

(D) The properinflation of tires by car owners, due to the fact that underinflation can wasteup to five percent of a car’s fuel by the increase of car-road friction, cansubstantially boost their fuel efficiency.（B）

(E) Because up tofive percent of a car’s fuel are wasted through the increases in car-roadfriction when the tires are underinflated, car owners properly inflating tirescan substantially boost their fuel efficiency.

A错在哪里了呢？？