We Presently Consider the Universe to Be Matter Dominated

We presently consider the universe to be matter dominated.In this stage,the number of photons:

A) vastly outnumbers the number of particles.
B) is vastly outnumbered by the number of particles.
C) is greatly outnumbered by the number of particles, but is less than the number of particles plus antiparticles.
D) is close to being equal to the number of particles

Correct Answer:

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