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.
- Athere are less than one-quarter that many
- Bthere are fewer than one-quarter as many
- Cthere are fewer than one-quarter of that amount 、
- Dthe number is less than one-quarter the amount
- Eit is less than one-quarter of that amount
- 答案说C错是因为 amount只能修饰不可数名词, 我觉得这里可以理解为 the amount of popularity, 这样C不就对了么
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