Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions:
-(Table: Demand for Lenny's Coffee) Look at the table Demand for Lenny's Coffee. Lenny's Café is the only source of coffee for hundreds of miles in any direction. If Lenny increases the quantity sold from five cups to six, his marginal revenue will be:

A) $4.
B) $24.
C) -$1.
D) $5.