Which two pieces of evidence most directly support the idea that during the first moments after the big bang, light elements formed from the original energy present?

A. The abundance of helium in the universe and Einstein's mass-energy equivalence
B. Einstein's mass-energy equivalence and the redshift of light from galaxies
C. The abundance of helium in the universe and the uniform distribution of cosmic background radiation
D. The redshift of light from galaxies and the uniform distribution of cosmic background radiation