Answer
(a) up
(b) down
(c) East
(d) West
Work Step by Step
We know that from the right-hand rule, if the fingers of our right hand are in the direction of $\vec E$ then the thumb points in the direction of propagation of the wave. Thus, we obtain the following results:
(a) The direction of the magnetic field is in the upward direction.
(b) The direction of the magnetic field is in the downward direction.
(c) The direction of the magnetic field is towards the East.
(d) The direction of the magnetic field is towards the West.
