Question

the \afterglow\ of the energy from the origin of the universe that we see today.
doppler effect
sunlight
cosmic microwave radiation
cosmic explosions

Explanation:

The "afterglow" of the energy from the origin of the universe (the Big Bang) is known as cosmic microwave radiation. The Doppler effect relates to wave frequency shifts, sunlight is from the Sun, and cosmic explosions are different phenomena. Cosmic microwave radiation is the residual thermal radiation from the early universe.

Answer:

Cosmic microwave radiation