Answer:
B) has just entered REM sleep
Step-by-step explanation:
REM sleep is deep sleep. It can also be called "rapid eye movement", because when an individual reaches this stage of sleep, he usually presents a rapid movement of the eyelids. Sleep Rem also allows the individual to show irregular and low amplitude wave patterns, in addition, in some cases it is normal for the individual to show involutory muscle movements in the hands and feet, similar to what Cliff is showing.
REM sleep also promotes breathing and a greater supply of oxygen to the body, in addition to being essential for cognitive development, body repair and memory processing.