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

A) shift the marginal cost curve from MC to either MC₁ or MC₂.
B) reduce the differences between each marginal benefit curve.
C) shift marginal benefit curves to the left.
D) shift marginal benefit curves to the right.