When a bicycle is slowing down, the wheels slow with an angular acceleration of $-15$ rad$/$s$2.$ If each wheel has a mass of $0\mathrm{.}4$ kg and a radius of $0\mathrm{.}3$ m$,$ what is the net torque on each wheel? Treat the wheels as hoops $($I $=$ MR$2).$ A $-0\mathrm{.}43$ N$$m B $-0\mathrm{.}72$ N$$m C $-0\mathrm{.}36$ N$$m D $-0\mathrm{.}54$ N$$m E $-6\mathrm{.}0$ N$$m