题目内容：
根据以下内容，回答题。Students enrolled at least half time may borrow up to $3,000 form the government over a two-year period．Repayment of the loan begins six months after the student leaves school．These loans carry on interest until this time．The current interest rate is 5 percent．Students may borrow up to $4,500 annually from a bank, credit union, savings and loan association or other eligible lender．Repayment on these loans usually begins six months after the student leaves school．These loans carry no interest until this time．This current interest rate is 9 percent．Parents may borrow up to $300 annually for each dependent college．Repayment begins forty-five days after receiving the loan, and the interest rate is 12 percent．
Which of the following is the main purpose? A．To remind students and their families to repay their loan．
B．To compare interest rates．
C．To inform students and parents of the various loans available．
D．To show that government loans charge the least interest．
参考答案：
答案解析：