If the Universe Had Expanded at Its Original Rate Beyond

Multiple Choice

If the universe had expanded at its original rate beyond the time when the strong nuclear force became a distinct force (about 10^-35 s after the Big Bang) , the isotropy problem would have arisen: Parts of the universe seen in opposite directions would never have been in equilibrium with each other and should not exhibit the degree of isotropy observed in the cosmic microwave background. The proposed solution to this problem is

A) the cosmological redshift.
B) quark confinement.
C) cosmic inflation.
D) the Grand Unified Theory (GUT) .