2(a)Bond d has the highest sensitivity to interest change, because it has the longest duration,and relatively less convexity.(You may deduce it from dP/dy=-D*dy+1/2*C*dy^2)
(b)It is easy to conculate by using dP/dy=-D*dy+1/2*C*dy^2)
(d) Bond e, the one that has lowest sensitivity to interest change