Today's technology allows manufacturers to make small cars more fuel-efficient now than at anytime in their production history.

(A) small cars more fuel-efficient now than at any time in their

(B) small cars that are more fuel-efficient than they were at any time in their

(C) small cars that are more fuel-efficient than those at any other time in

(D) more fuel-efficient small cars than those at any other time in their

(E) more fuel-efficient small cars now than at any time in


OA:[spoiler] C why is D in-correct?[/spoiler]