A ball of mass `(m) 0.5 kg` is attached to the end of a string having length `(L) 0.5 m`. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is `324 N`. The maximum possible value of angular velocity of ball (in radian//s) is -

.
A. 9
B. 8
C. 27
D. 36