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

by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.

for your : )

was found at b)south carolina

i also think it is c