The Equation That Gives the Particle Displacement of a Medium $\pi$

Multiple Choice

The equation that gives the particle displacement of a medium in which there is a simple harmonic progressive wave is where the units are SI.At t = 2 s,the velocity of a particle at x = 10 m is

A) 0
B) 2 m/s
C) 4/ $\pi$ m/s
D) 4 m/s
E) 8 m/s