D. Electromagnetic waves
Generally, Electromagnetic waves consist of both electric and magnetic field waves. These waves oscillate in perpendicular planes with respect to each other, and are in phase.The creation of all electromagnetic waves usually begins with a charged particle, which creates oscillating electric and magnetic fields.Once they are in motion, the electric and magnetic fields that are charged in particles creates are self-perpetuating: time-dependent change in one field (electric or magnetic) to produce the other.
