关于一道题目的正确答案

Today’s technology allows manufacturers to make small cars more fuel-efficient now than at any time 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

此题的正确答案是B吗?

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