In an Electromagnetic Wave in Free Space,the $\vec { E }$

Multiple Choice

In an electromagnetic wave in free space,the $\vec { E }$ field and $\vec { B }$ fields are

A) parallel to one another and perpendicular to the direction of wave propagation.
B) parallel to one another and parallel to the direction of wave propagation.
C) perpendicular to one another and perpendicular to the direction of wave propagation.
D) perpendicular to one another and parallel to the direction of wave propagation.