Which of the following best describes electromagnetic waves?
• A. Electromagnetic waves cause particles in a medium to vibrate
parallel to the direction of wave travel.
• B. Electromagnetic waves are produced by a disturbance in a
medium.
• C. Electromagnetic waves cause particles in a medium to vibrate
perpendicular to the direction of wave travel.

D. Electromagnetic waves are produced by a disturbance in electric a
and magnetic fields.