A town is debating whether to install a guard rail along a winding road. The cost of this guard rail will be $40, 000, and it is expected to prevent three motor vehicles from sliding off the road. On average, when a motor vehicle slides off the road, it causes $20, 000 in damage. The town should
a. purchase and install the guard rail because human safety is priceless.
b. purchase and install the guard rail because the benefit outweighs the cost.
c. not. install the guard rail because the cost outweighs the benefit
d. not install the guard rail because motor vehicle owners have automobile insurance.