【正确答案】 B

【答案解析】Coupon Treasury bonds and most corporate bonds are non-amortizing securities because they pay only interest until maturity. At maturity these bonds repay the entire par value or face value. MBS are backed by pools of loans that generally have a schedule of partial principal payments, making these securities amortizing securities. A sinking fund provision is another example of an amortizing feature of a bond. This feature is designed to pay a part or the entire total of the issue by the maturity date.