XY06-41 less和fewer用法请大家指导

C和D应该选哪个？

GWD-8-Q41:

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.

1. there are less than one-quarter that many

2. there are fewer than one-quarter as many

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

4. the number is less than one-quarter the amount

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

C肯定不对, fewer than that amount 不对

B和D里面选一个

B 里省略了 as

D里one quarter the amount是否正确