问题如下：
Which bond offers the lowest yield-to-maturity?
选项：
A.Bond A
B.Bond B
C.Bond C
解释：
A is correct.
Bond A offers the lowest yield-to-maturity. When a bond is priced at a premium above par value the yield-to-maturity (YTM), or market discount rate is less than the coupon rate. Bond A is priced at a premium, so its YTM is below its 5% coupon rate. Bond B is priced at par value so its YTM is equal to its 6% coupon rate. Bond C is priced at a discount below par value, so its YTM is above its 5% coupon rate.
这个题目怎么知道par value等于100？
