A constant torque acting on a uniform circular wheel changes its angular momentum from A to 4A in 4sec. The torque acted on it is

• A

  $\frac{3\mathrm{A}}{4}$

• B

  $\frac{\mathrm{A}}{4}$

• C

  $\frac{2\mathrm{A}}{4}$

• D

  $\frac{3\mathrm{A}}{2}$