Aman is attending school and had a financial emergency. He contacted his schools financial aid office and asked about a subsidized student loan. Amans school facilitates these loans and determined that Aman qualifies for a $420 loan. Aman is able to repay the loan over the next 12 months while he is still in school. How much interest will Aman pay on this loan?

a. $0 because interest on subsidized loans does not accrue until Aman stops attending school.

b. $21.00 because the interest rate is 5%.

c. $10.50 because Aman has been making payments on the loan.

d. None of the choices are correct.