The Isotropy of the Cosmic Microwave Background Radiation (Same Temperature

Multiple Choice

The isotropy of the cosmic microwave background radiation (same temperature in all directions) indicates that

A) the universe has always been dominated by matter.
B) the universe had an early period of inflation in which regions initially in contact were carried out of contact with each other.
C) the universe did not begin to expand significantly until after the era of recombination.
D) regions that appear to us to be on opposite sides of the visible universe are in fact in close contact with each other.