What happens when one enters a dream state?

A、Thebodycontinuestoactasifthesleeperwereawake.
B、Theneuralactivityofthebrainwillbecomeintensified.
C、Thebrainbehavesasifitwereplayingavirtualrealityvideogame.
D、Thebrainonceagainexperiencesthelearningactivitiesoftheday.