Which bond among the following bonds has the lowest interest rate risk given they all have the same yield to maturity?

A$.5-$year maturity; $7$ percent coupon bond

B$.5-$year maturity: $5$ percent coupon bond.

C$.10-$year maturity; $7$ percent coupon bond.

D$.10-$year maturity; $5$ percent coupon bond

E$.15-$year maturity; $7$ percent coupon bond.

F$.15-$year maturity; $7$ percent coupon bond.