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.
The marginal cost of providing security cameras would shift from MC to MC₁ if

A) a natural disaster increased the value of security cameras in a neighboring town.
B) technological advances made it easier to monitor multiple cameras from a single location.
C) more firms began substituting cameras for live security guards.
D) a crime wave increased the demand for security.