Exhibit 15.1 -Refer to Exhibit 15.1,which Shows the Cost and Revenue Curves

Exhibit 15.1

-Refer to Exhibit 15.1,which shows the cost and revenue curves for a natural monopolist-the operator of a subway system.To achieve the efficient output rate,regulators could set the price at ____ per trip.

A) $4.00
B) $2.50
C) $1.50
D) $1.25
E) $0.50