Given a Wave Pulse That Is Traveling in The $\hat { i }$

Given a wave pulse that is traveling in the $\hat { i }$ direction while its electric field is in the $- \hat { k }$ direction, the magnetic field is in the

A) $- \hat { j }$ direction.
B) $\hat {j }$

direction.
C) $- \hat { k } + \hat { i }$ direction.
D) $- \hat { k } - \hat { i }$ direction.