A planet is revolving round the sun in an elliptical orbit, If v is the velocity of the planet when its
position vector from the sun is r, then areal velocity of the planet is

• A

  $|\mathbf{v}\times \mathbf{r}|$

• B

  $2|\mathbf{r}\times \mathbf{v}|$

• C

  $\left|\frac{1}{2}(\mathbf{r}\times \mathbf{v})\right|$

• D

  None of these