When an electron jumps from high-to low-energy levels:

A. Radio and gamma rays are produced.

B. A wave of visible light is produced.

C. A wave with parallel electric and magnetic fields results.

D. Waves of differing speeds may be produced.

B. A wave of visible light is produced.

Explanation:

The visible light spectrum is in the centre of the Electromagnetic Spectrum, so any time an electron jumps from high to low levels of radiation, it has to cross through the visible spectrum.

I hope this is correct, and as always, I am joyous to assist anyone at any time.