Suppose that installing an overhead pedestrian walkway would cost a college town $150,000. The walkway is expected to reduce the risk of fatality by 3 percent, and the cost of a human life is estimated at $10 million. The town shouldA. install the walkway because the estimated benefit is twice the cost. B. install the walkway, since the cost of even a single life is too great not to take action. C. not install the walkway, since the cost is twice the estimated benefit. D. install the walkway because the estimated benefit equals the cost.