McBride: The proposed new fuel-efficiency standards, if implemented, will discourage the manufacture of full-size cars. This prospect is troubling because when a subcompact and a full-size car collide, the people in the subcompact are more likely to be seriously injured than if theirs had also been a full-size car. The new fuel-efficiency standards should ttherefore be opposed. Leggett: But whenever any two cars collide, it is more likely that someone will be seriously injured if one of the cars is a full-size car than if neither car is full-size. So the new fuel-efficiency standards should be supported precisely because they discourage the manufacture of full-size cars. McBride's and Leggett's statements commit them to disagreeing about the truth of which one of the following? ['Fuel conservation is less important than safety in case of a collision.', 'The manufacture of full-size cars should be discouraged.', 'The new fuel-efficiency standards will encourage automobile manufacturers to build more subcompact cars.', 'Reducing the number of full-size cars on the highway will reduce the frequency of collisions between automobiles.']