Two particles A and B are moving in uniform circular motion in concentric circles of radii ${\mathrm{r}}_{\mathrm{A}}\text{ and }{\mathrm{r}}_{\mathrm{B}}$ with speed ${\mathrm{v}}_{\mathrm{A}}\text{ and }{\mathrm{v}}_{\mathrm{B}}$ respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be

• A

  $1: 1$

• B

  ${\mathrm{r}}_{\mathrm{A}}:{\mathrm{r}}_{\mathrm{B}}$

• C

  ${\mathrm{v}}_{\mathrm{A}}:{\mathrm{v}}_{\mathrm{B}}$

• D

  ${\mathrm{r}}_{\mathrm{B}}:{\mathrm{r}}_{\mathrm{A}}$