A small but heavy block of mass 10 kg is attached to a wire 0.3 m long. Its breaking stress is $4.8\times {10}^7\mathrm{N}/{\mathrm{m}}^2$. The area of the cross section of the wire is ${10}^{-6}{\mathrm{m}}^2$. The maximum angular velocity with which the block can be rotated in the horizontal circle is

• A

  4 rad/s

• B

  8 rad/s

• C

  10 rad/s

• D

  32 rad/s