The Cosmic Microwave Background Is Found to Be Extremely Uniform

Multiple Choice

The cosmic microwave background is found to be extremely uniform throughout space, with only very small fluctuations in intensity. The event that produced this remarkable smoothness in the early universe was

A) the occurrence of the Big Bang everywhere in space at the same time.
B) the start of the production of matter in the universe, which smoothed out the irregularities in space.
C) an exemplar of Heisenberg's uncertainty principle, which prevented the concentration of radiant energy in localized volumes of space.
D) a sudden but brief period of rapid expansion (cosmic inflation) of the universe during the general expansion of the early universe.