The sequence of steps in which the four forces separated out from a single force after the Big Bang was:
a. first the gravitational force separated from electroweak combined with strong; then electroweak and strong separated; then electroweak separated into weak and electromagnetic.
b. first the electroweak force separated out; then gravitation separated out from strong; then electroweak separates into electromagnetic and weak.
c. first the strong force separates; then electroweak separates out from gravitational; then electroweak separated into electromagnetic and weak.
d. first electroweak force separated; then electroweak separated into electromagnetic and weak; then strong and gravitational separated.
e. first gravitational force, electroweak, and strong forces separated into three; then electroweak separated into electromagnetic and weak.
a
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