AMC 8 1990 Problem 17

A straight concrete sidewalk is to be $3$ feet wide, $60$ feet long, and $3$ inches thick. How many cubic yards of concrete must a contractor order for the sidewalk if concrete must be ordered in a whole number of cubic yards? $\text{(A)}\ 2 \text{(B)}\ 5 \text{(C)}\ 12 \text{(D)}\ 20 \text{(E)}\ \text{more than 20}$