Car owners

[vbhalla81]

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.


I've narrowed it down to A and B. But can't really see why A is wrong. Can someone clarify?

[viveksingh]

We need because in place of since in A. As such this has became a run on sentance.
Car oweners who DO A can DO B, since the increase can DO C car owerners should DO D.
something like underline portion is needed to complete the santence.

[CAD]

IMO B.

A doesnot show that it is the underinflation (of the tyres) which causes increase in car-road friction.

[penfriend]

IMO, A is wrong because of "their".

Car owners who inflate their tires properly inflate should refer to car's tyres, not owner's tyres. B is the correct answer

[jamesbond007]

penfriend's logic is perfect.
In Option A, "their tires" is the biggest mistake. It means the tyres of owners...
B has no error as such.
Moreover, the cause of friction - underinfletion - is correctly and clearly described in option B. in A, it is not so clear.
hence B is correct answer.

[dipaksingh]

B is best.

[he_hels]

B for me too.
"their" in A wrong.
"car's fuel" in B sounds better than "car fuel" in A

[cc2005]

Wrong Modifier in A

[goel_ar]

B for me tooo..Official Answer?

[vbhalla81]

B.

Thanks Vivek, your right, the strongest error appears to be the wrong usage of "since"