Figure 142 Amit and Bree Are the Only Two Homeowners

Multiple Choice

Figure 14.2 Amit and Bree are the only two homeowners on an isolated private road.Both agree that installing street lights along the road would be beneficial and want to do so.Figure 14.2 shows their willingness to pay for different quantities of street lights, the market demand for street lights and the marginal cost of installing the street lights.
-Refer to Figure 14.2.The optimal quantity of street lights to install is

A) 3
B) 4
C) 6
D) 9