Within which time interval from the initial Big Bang do we believe all four fundamental forces of nature were united into a single force? A)t = 0 to 10^-43 second, the Planck time, when gravity "froze out" of the universe B)t = 0 to 10⁶ years, when radiation dominated the universe C)t = 0 to 10^-35 second, when the strong nuclear force "froze out" of the universe D)t = 0 to 1 second, when photons interchanged freely with electron-positron pairs

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The unification of all four fundamental forces into a single force is believed to have occurred during the Planck epoch, which lasted from t = 0 to 10^-43 seconds after the Big Bang. During this time, the universe was incredibly hot and dense, and all four forces were unified. As the universe expanded and cooled, the forces separated and distinct interactions emerged. Gravity "froze out" first, followed by the strong and weak nuclear forces, leaving only the electromagnetic force.

Within Which Time Interval from the Initial Big Bang Do