As the winner of a songwriting competition, you can choose between the prizes listed below. If the interest rate is 9%, which prize is the most valuable?

a. $10,000 a year forever

b. $7,000 next year and increasing by 2.5 percent a year forever.

c. $115,000 now.

d. $165,000 at the end of four years.

e. $18,500 each year for 10 years.