If We "Reverse" Hubble Expansion, We See That the Universe

Multiple Choice

If we "reverse" Hubble expansion, we see that the universe should have been very dense in the distant past, and so it must have been ________ than it is today, and we should be able to
Observe ________ as a result.

A) much colder; cosmological redshift
B) much colder; the cosmic microwave background
C) much hotter; gravitational redshift
D) much hotter; the cosmic microwave background
E) much hotter; black holes