Abigail's Auto Art Is a Company That Applies Pinstripes to Vehicles

Multiple Choice

Abigail's Auto Art is a company that applies pinstripes to vehicles. Abigail's cost for a basic 1-colour pinstriping job is $40, and she charges $100 for this service. For a total price of $185, Abigail will apply a fancier 3-colour pinstripe application to an automobile, a service that adds an additional $50 to the total cost of the package. What is the marginal cost of moving up from the 1-colour application to the 3-colour application?

A) $40
B) $50
C) $100
D) $175