As a Part of a Research,Natasha Initially Had Difficulty Falling

Multiple Choice

As a part of a research,Natasha initially had difficulty falling asleep in the sleep lab,but finally drifted into sleep and was not awakened when a student researcher knocked a can of soda off the desk. The electroencephalograph (EEG) is displaying theta waves with occasional sleep spindles.The researchers feel confident that Natasha is:

A) about to wake up.
B) in stage 2 of the sleep cycle.
C) dreaming.
D) in REM sleep.