The position vector of a particle is
$\mathrm{r}=(\mathrm{acos}\mathrm{\omega t})\mathrm{i}+(\mathrm{asin}\mathrm{\omega t})\mathrm{j}$
The velocity of the particle is

• A

  parallel to position vector

• B

  perpendicular to position vector

• C

  directed towards the origin

• D

  directed away from the origin