I need help with all parts, thank you!

Which of the following bonds offers the highest current yield? a. A(n)4.02%,19-year bond quoted at 42.130 . b. A(n)6.70%,28-year bond quoted at 70.217 . c. A(n)2.01%,23 year bond quoted at 21.065 . The current yield of the bond in part a is \%. (Round to two decimal places.)