A Store Remains Open from 8 A

A store remains open from 8 a.m. to 4 p.m. each weekday. The store owner is deciding whether to stay open an extra hour each evening. The owner's marginal benefit

A) must be greater than or equal to the owner's marginal cost if the owner decides to stay open.
B) is the benefit the owner receives from staying open from 8 a.m. to 5 pm.
C) is the benefit the owner receives from staying open from 8 a.m. to 6 pm.
D) depends on the revenues the owner makes during the day.