The answer is: D. You are responsible for paying all the interest that accumulates on your loan.
On average, the interest rates for student loan in untied states is around 6.8 - 7.7% and would keep accumulating until you pay them all. Unlike any other type of loans, you are still responsible to pay your student loans even if you declare bankruptcy. The repayment plan can be adjusted according to your convenience, but additional fees or interest may apply if you choose to do so.