Yes, it does seem to mean that. The answer says "Most households whose members do ANY long-distance driving," subtely suggesting that they do local driving but at least some times use a car for long-distance travel.
Basically, the author is saying that manufacturers make two types of cars: lighter, fuel-efficient once (for local driving) and heavier, safer ones (for long-distance). In order to claim lower fuel use AND no loss in safety, the author must be assuming that people have both cars for the different types of trips. (A) is really the only answer that addresses that concept.