Please show work

Which of the following bonds will have the least percentage change in value if interest rates (YTM not coupon rates since coupon rates are fixed) on all bonds increased by 1%?

A. a ten-year bond with a $2000 face value whose coupon rate is 6.8%

B. a 15-year bond with a $5000 face value whose coupon rate is 6.2%

C. a 20-year bond with a $3000 face value whose coupon rate is 5.4%

D. a 30-year bond with a $1000 face value whose coupon rate is 6.4%