At What Stage in the Universe's History Do We Think

Multiple Choice

At what stage in the universe's history do we think the asymmetry between matter and antimatter was created?

A) at the very moment the Big Bang occurred
B) around the time gravity separated out of the single superforce
C) around the time the strong force separated out of the grand unified theory
D) around the time the weak force and electromagnetism separated
E) around the time the electric and magnetic forces separated