During the Epoch of Cosmic Inflation, the Universe Expanded Very

Multiple Choice

During the epoch of cosmic inflation, the universe expanded very rapidly. What was the effect on the temperature of the universe?

A) As the universe expanded rapidly, it cooled rapidly. Thereafter it expanded and cooled at a more moderate rate.
B) Because of the incredible speed of the expansion, there was no time for particles to exchange energy. Thus, the temperature remained constant during the expansion.
C) Because of the tremendous amount of energy available, the temperature actually rose during the expansion.
D) The temperature decreased during the expansion and then rose again to essentially the value it had initially.