请教一个语法题目

草木染湘

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.

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

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

C 想请问一下，fewer和amount可以在一起用吗？一个是可数，一个是不可数，感觉有点矛盾，这样的话，感觉E才是最好的答案吧。

shaoheng1120

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.

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

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

C 想请问一下，fewer和amount可以在一起用吗？一个是可数，一个是不可数，感觉有点矛盾，这样的话，感觉E才是最好的答案吧。

-- by 会员 草木染湘 (2011/12/27 17:04:31)

LZ从前文看drive-ins 是一个可数名词的复数，根据were和4000，
所以less和it 都说不通。
amounts of,an amount of接不可数名词，相当于much。
但是the amount  or that amount，这里表示数额，也就是数值，没有可数不可数之分。
这里that amount=4000.

戴小真

为啥B不行呢？as many不就代表前面提到的数字嘛？