いつもお世話になってます。下記の問題ついて分かられる方はご教授願います。

<Car owners who inflate their tires properly can substntially boost their vehicle's 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 substntially boost their vehicle's 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.

Ans.(B)
(A)と(B)の間で正解の選び方が分かりません。どちらもOKな感じがしますが、どうやって(A)を切るのでしょうか？

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