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 N2 of the sleep cycle.
C) dreaming.
D) in REM sleep.