A small but heavy block of mass `10 kg` is attached to a wire `0.3 m` long. Its breaking stress is `4.8 xx 10^(7) N//m^(2)`. The area of the cross section of the wire is `10^(-6) m^(2)`. The maximum angular velocity with which the block can be rotated in the horizontal circle is
A. `4rad//s`
B. `8rad//s`
C. `10rad//s`
D. `32rad//s`