The equation of a transverse travelling on a rope is given by `y=10sinpi (0.01x-2.00t)` where y and x are in cm and t in seconds. The maximum transverse speed of a particle in the rope is about
A. ` 63cm //s`
B. ` 75 cm//s`
C. ` 100 cm //s`
D. ` 121 cm //s`