In Vacuum, the Components of An $\mathrm{EM}^{2}$ Wave Are , And $\mathrm{E}_{\mathrm{z}}=0$

In vacuum, the components of an $\mathrm{EM}^{2}$ wave are $\mathrm{E}_{\mathrm{y}}=(50 \mathrm{~V} / \mathrm{m}) \cos \left[\left(5.00 \mathrm{~m}^{-1}\right) \mathrm{x}+\omega \mathrm{t}\right], \mathrm{E}_{\mathrm{x}}=0$ , and $\mathrm{E}_{\mathrm{z}}=0$ . In what direction is this wave moving?

A) positive $y$ -direction
B) negative $x$ -direction
C) positive $x$ -direction
D) positive or negative z-direction
E) negative y-direction