The Displacement of a String Carrying a Traveling Sinusoidal Wave $\phi$

The displacement of a string carrying a traveling sinusoidal wave is given by At time t = 0 the point at x = 0 has velocity v₀ and displacement y₀.The phase constant $\phi$ is given by tan $\phi$ =:

A) "v₀/ $\omega$ y₀"
B) " $\omega$ y₀/v₀"
C) " $\omega$ v₀/y₀"
D) "y₀/ $\omega$ v₀"
E) " $\omega$ v₀y₀"