Airlines Generally Charge Travelers Willing to Stay Over Saturday Night

Airlines generally charge travelers willing to stay over Saturday night lower fares because

A) these travelers have lower incomes, and therefore, the airlines would like to help them.
B) it cost less to transport travelers willing to stay over a Saturday night.
C) the demand of these travelers is elastic, and therefore, the lower fares generate more revenue.
D) the demand of these travelers is inelastic, and therefore, the lower fares generate more revenue for the airlines.