$4)$ Which portfolio would be most sensitive to a change in interest rates A$)$ five $$1000,-$year annual coupon bonds with a $10\%$ coupon, B$)$ a $$5000,5-$year semi$-$annual coupon bond, with $10\%$ coupons, or C$)$ a $$5000,3-$year annual coupon bond with a $10\%$ coupon