A body is initially at rest. It under goes one dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

• A

  $t^{\frac{1}{2}}$

• B

  t

• C

  $t^{\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$

• D

  $t^2$