求助GWD-3-Q30

abcd1234czyf

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[CH1]

B.small cars that are more fuel-efficient than they were[CH2] 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[CH3]
E.more fuel-efficient small cars now than at any time in
解释里面说B选项they 指代不清，那C选项里面的those不是也指代不清么，为什么C选项就可以作为正确选项呢

E.more fuel-efficient small cars now than at any time in
解释里面说B选项they 指代不清，那C选项里面的those不是也指代不清么，为什么C选项就可以作为正确选项呢

xinruiAbby

比较时要除去自己 不能和自己比， 所以要用 any other time而不是 any time。
B选项 they  manufacturers?or cars?
C选项后有时间状语 修饰 所以不会有歧义认为是manufacturers