A small piece of cork in a ripple tank oscillates us and down as ripples pass it. If the ripples travelling at 0.3 m/s, have a wavelength of `1.5 pi` cm and the cork vibrates with an amplitude of 5mm, then the maximum velocity of the cork will be
A. 20 cm/s
B. 0.02 cm/s
C. 20 m/s
D. 200 m/s