Both Protons and Neutrons (And Their Anti-Particles)froze Out:
A)after $10^{ - 43}$

Multiple Choice

Both protons and neutrons (and their anti-particles) froze out:

A) after $10^{ - 43}$ seconds, at the Planck Era.
B) at $1032 \mathrm {~K}$ at the end of the Inflationary Era.
C) at $1013 \mathrm {~K} \text {, }$ , bout .0001 seconds after the Big Bang.
D) after about a minute of expansion.
E) about 50,000 years after the Big Bang.