The program selection committee presents several programs for approval:
Program A is estimated to cost US$250,000, and has an annual cash inflow of US$75,000.
Program B is estimated to cost US$150,000, and has an annual cash inflow of US$55,000.
Program C is estimated to cost US$100,000, and has an annual cash inflow of US$45,000.
Program D is estimated to cost US$200,000, and has an annual cash inflow of US$35,000.
Which program was selected based solely on a three-year return on investment?