比较级的一题，求解！

Xiaotongdi

185.(26406-!-item-!-188;#058&001926)(GWD-8-Q41)



When drive-ins were at the height of their popularity in the late 1950s, 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

答案在B与C中徘徊！正确的是B，我选了C。
我分析C，觉得语感很对呀，但是of that amount是不是指代不清？

cheshou

我认为 amount 用在不可数名词，so CDE排出。

that many 不对；that , these 不指代。

个人愚见，不是特别肯定。

Xiaotongdi

恩恩，但是我理解这个amount是用于名词，就是数量的意思。amount作名词也是表示不可数的？

Xiaotongdi

明白了明白了！amount 后面其实如果加上of the drive-ins就错了！