Answer the following question given this paragraph: 

The energy of an electromagnetic wave travels in a straight line along the path of the wave. The moving light wave has associated with it an oscillating electric field and an oscillating magnetic field. Scientists often represent the electromagnetic wave with the image below.


Q: What kind of path does the energy of an electromagnetic wave take?

 Choices:

- elliptical

- circuitous

- fluctuating

- straight line

A:
straight line
