A string is wound around a hollow cylinder of mass 5 kg and radius 0.5 m. If the string is now pulled with a horizontal force of 40 N, and the cylinder is rolling without slipping on a horizontal surface (see figure), then the angular acceleration of the cylinder will be (Neglect the mass and thickness of the string)

A

20 rad/s$$^2$$

B

16 rad/s$$^2$$

C

12 rad/s$$^2$$

D

10 rad/s$$^2$$