Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10-38 second after the Big Bang?
A) These two forces first became distinct at this time.
B) These forces are important only at temperatures below the freezing point of water—a temperature that the universe reached at an age of about at 10-38 second.
C) Freezing out was a term coined by particle physicists who think that the Big Bang theory is really cool.
D) Following this time, neither the strong nor electroweak forces were ever important in the universe again.
A
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