请帮确认 一下答案是否正确

zhongweiwei

Q30:

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

 

1. small cars more fuel-efficient now than at any time in their
2. small cars that are more fuel-efficient than they were at any time in their
3. small cars that are more fuel-efficient than those at any other time in

4. more fuel-efficient small cars than those at any other time in their

5. more fuel-efficient small cars now than at any time in

这题算是出现频率较高的老题了，请帮确认一下答案是否是C，我突然有点不确定。

AlienX

prep上有...C