Yield to Maturity Question:

Which one of these three bonds is a better buy i.e. has higher yield to maturity. Solve YTM for each bond

Bond A: Maturity 10yr , Semiannual Coupon 3% (1.5% paid every 6 month), Price 81,

Bond B: Maturity 10yr, Annual Coupon 3% Price 81,

Bond C Maturity 11yr, Annual Coupon 3.5% Price 70.