A particle of mass m is moving along a circle of radius r with a time period T. Its angular momentum is

• A

  $\frac{2\mathrm{\pi mr}}{\mathrm{T}}$

• B

  $\frac{4\mathrm{\pi mr}}{\mathrm{T}}$

• C

  $\frac{2{\mathrm{\pi mr}}^2}{\mathrm{T}}$

• D

  $\frac{4{\mathrm{\pi mr}}^2}{\mathrm{T}}$