A college student needs to barrow 3,000 today for his tuition bill. He agrees to pay back the loan in a lump-sum payment four years from now, after he's out of college. The bank states that the payment will need to be 3,646.52. If he borrows 3,000 from the bank, the annual interest rate he's paying on his loan is closest to:

a- 5%

b- 15%

c- 8%

d- 14%