All else equal, which of the following bonds would give you the highest capital gain return if interest rates (yields) fall 2 percentage points from 7% to 5%?

a.6% coupon, 20-year maturity bond

b.6% coupon, 2-year maturity bond

c.3% coupon, 20-year maturity bond

d.3% coupon, 2-year maturity bond

e.Zero coupon, 20-year maturity bond

f.Zero coupon, 2-year maturity bond

could you show how to find the different yields of each option as I need to know how for my test, thank you!