Ryan Is Hooked Up to an Electroencephalograph (EEG)in a Sleep

Multiple Choice

Ryan is hooked up to an electroencephalograph (EEG) in a sleep lab.As the researcher watches the printout from the EEG,sleep spindles begin to appear.Based on this information,the researcher can conclude that Ryan

A) is currently in REM sleep.
B) has just entered Stage 2 sleep.
C) has just entered Stage 1 sleep.
D) is still awake, but is relaxed and drowsy.