Physicists Speculate That,early in Its History,the Universe Shifted from a "False

Physicists speculate that,early in its history,the universe shifted from a "false vacuum" state to a "true vacuum" state.What is the significance of this transition?

A) The "false vacuum" describes the state of the universe before the Planck time, 10-⁴³ s. During this time, the laws of physics as we currently understand them did not apply.
B) The transition was from a high-energy state to a low-energy state. The consequent release of energy fueled the inflationary epoch.
C) The transition was one from a low-energy state to a high-energy state. The consequent intake of energy caused the universe at the end of the inflationary epoch to be much cooler than it had been at the beginning of the inflationary epoch.
D) In its transition to the true vacuum, the universe became trapped in a state of minimum energy, unable to expand or contract.