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