Which of the Following Observations Cannot Be Explained by the Big

Multiple Choice

Which of the following observations cannot be explained by the Big Bang theory unless we assume that an episode of inflation occurred?

A) The fact that the temperature of the cosmic microwave background is almost the same everywhere
B) The fact that about 25% of the ordinary matter in the universe consists of helium
C) The existence of the cosmic microwave background
D) The fact that the universe is expanding