Which statement about the cosmic microwave background is not true

A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies.
B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero.
C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old.
D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.