Which of the following has more interest risk? Why?

Question

A. Bond A with a 10% Coupon and a YTM of 10% which matures in 5 years.
B. Bond B with a 10% Coupon and a YTM of 10% which matures in 11 years.
C.) A share of Preferred Stock that pays $10 dividend in perpetuity with a required rate of 10%
***i know B is more risk than A but I'm stuck between B and C and I also need an explanation of why...thanks