If a bond has a duration of $15$ years, how much would you expect the bond to change if interest rates increased by $0\mathrm{.}50\%?$

A$)$

The bond would decrease $15\%.$

B$)$

The bond would increase $15\%.$

C$)$

The bond would decrease $7\mathrm{.}5\%.$

D$)$

The bond would increase $7\mathrm{.}5\%.$