Brian has greater difficulty remembering what he learns during a foreign language vocabulary tutorial if he experiences less than his normal amount of rem sleep the night after the tutorial session. Which theory best accounts for brian's experience?

The answer is "information-processing theory".

The information processing theory is a way to deal with the cognitive development of an individual, which manages the investigation and the examination of the succession of occasions that happen in a man's brain while accepting some new snippet of data. The data handling hypothesis, as we probably am aware it today, was not made but rather created by George Miller.