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

Multiple Choice

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

A) has just entered Stage 3 sleep.
B) is still awake, but is relaxed and drowsy.
C) has just entered Stage 1 sleep.
D) is currently in REM sleep.