Why is the end of the plasma Universe so important to the creation of greater complexity? Choose 1

A
At the end of the plasma Universe, 380,000 years after the Big Bang, human life began.

(Choice B)
B
The Universe cooled enough to allow for the formation of atoms.

(Choice C)
C
The fundamental force, gravity, was created.

(Choice D)
D
Energy could no longer be created or destroyed.