The correct answer is C. Perpetuity.
A perpetuity is an annuity with an infinite life and continuous annual payments. It is a special type of annuity where the payments are made forever. The present value of a perpetuity is equal to the annual payment divided by the interest rate.
APR stands for annual percentage rate. It is a measure of the cost of borrowing money. It is calculated by taking the interest rate and multiplying it by the number of times the interest is compounded per year.
An amortized loan is a loan that is paid off over time in equal installments. The payments include both principal and interest. The principal is the amount of money that was borrowed, and the interest is the fee that is charged for borrowing the money.
Principal is the amount of money that is borrowed. It is the amount that is repaid over time, plus interest.