gwd 21-13 的逻辑错误？

GWD 21-13

When drive-ins were at the height of their popularity in the late 1950’s, some 4,000 existed in the United States, but today there are less than one-quarter that many.

One Quarter of the amount

A. there are less than one-quarter that many

B. there are fewer than one-quarter as many

C. there are fewer than one-quarter of that amount

D. the number is less than one-quarter the amount  : the number is ….one –quarter of the amount. (C)

E. it is less than one-quarter of that amount :

这个题原来讨论的时候。carolhide MM 提到 The number refer to 4000 has logical problem,我不太理解。这里的逻辑错误是什么。还请carolhide MM在解释一下

呵呵，刚看见。

题目的逻辑意思是现在的数字fewer than one-quarter of that amount

如果按照D的说法the number指代4，000

那句子就变成4，000is less than one-quarter the amount  （the amount又不知道指代什么）

请指正！！