What Are the Two Key Observational Facts That Led to Widespread

Multiple Choice

What are the two key observational facts that led to widespread acceptance of the Big Bang model?

A) the cosmic background radiation and the high helium content of the universe
B) the cosmic background radiation and the expansion of the universe
C) the cosmic background radiation and the near-critical density of the universe
D) the predominance of matter over antimatter and the near-critical density of the universe
E) the predominance of matter over antimatter and the large scale structure of galaxies