In Cosmology, What Is the "Inflationary Period

Multiple Choice

In cosmology, what is the "inflationary period"?

A) the period when the cost of living rose faster than astronomers' salaries
B) the first 500,000 years of the life of the universe, when matter and radiation interacted vigorously
C) the period of universal expansion from the Big Bang to the present
D) the short period of extremely rapid expansion when the universe was very young