Rebecca is hooked up to an electroencephalograph (EEG) in a sleep lab.As the researcher watches the printout from the EEG,delta waves appear.What can the researcher conclude about Rebecca's state of consciousness,based on this information

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

Delta Waves

Slow brain waves typically associated with deep sleep and certain brain disorders, recorded with an electroencephalogram (EEG).

Electroencephalograph (EEG)

A device used to measure and record the electrical activity of the brain.

Stage 3 Sleep

Stage 3 sleep is a period of deep, restorative sleep characterized by slow brain waves known as delta waves, essential for physical and mental rejuvenation.