Suppose That the Marginal Benefit of Having a Security Camera

Multiple Choice

Suppose that the marginal benefit of having a security camera in the library is given by MB,at the supermarket is given by MB₁ and at the museum is given by MB₂.All values are per week.
An increase in crime would ______ expenditures on security cameras and _____ the number of cameras.

A) increase;increase
B) increase;decrease
C) decrease;increase
D) decrease;decrease