A solid disc rolls clockwise without slipping over a horizontal path with a constant speed v. Then the magnitude of the velocities of points A, B and C (see figure) with respect to a standing observer are, respectively, 

• A

  v, v and v

• B

  2v, $\sqrt{2} \mathrm{v} \mathrm{and} \mathrm{zeros}$

• C

  2v, 2v and zero

• D

  2v, $\sqrt{2} v$ and $\sqrt{2} \mathrm{v}$