Answer:
B. Anya will spend a greater proportion of her sleep time than usual in the REM stage. This phenomenon is called rebound.
Explanation:
REM Rebound: The term REM rebound is described as the process that involves the depth of an individual's rapid eye movement sleep i.e, REM sleep and increasing & lengthening frequency that generally occurs after a prolonged period of "sleep deprivation". According to the researcher, when an individual is being prevented or hindered from taking or experiencing the "REM sleep" then he or she takes less time as compared to the usual time to reach to the REM stage of the sleep.