DeShawn's Detailing Is a Service That Details Cars at Customers

DeShawn's Detailing is a service that details cars at customers' homes or places of work.DeShawn's cost for a basic detailing package is $40,and he charges $75 for this service.For a total price of $90,DeShawn will also detail the car's engine,a service that adds an additional $20 to the total cost of the package.Should DeShawn continue to offer the engine detailing service?

A) Yes, he still makes a profit by selling the engine detailing service with the basic detailing package.
B) Yes, but only if he raises the price of the basic detailing package.
C) No, his marginal benefit is less than his marginal cost.
D) More information is needed for DeShawn to make this decision.