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: When drive-ins were at the height of their popularity in the late 1950’s, some 4000 existed in the US, but today there are less than one-quarter that many. fficeffice" />
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 number