If your brainwaves change from a beta pattern to a delta pattern,what aspect has changed

A)  amplitude 
B)  frequency 
C)  location of activity 
D)  number of active areas

Beta Pattern

A pattern of brain wave activity with a frequency range of about 12-30 Hz, associated with wakefulness, alertness, and active concentration.

Delta Pattern

A type of brain wave that is associated with deep sleep and is characterized by low frequency and high amplitude.

Brainwaves

Electrical impulses in the brain that can be measured and are indicative of various states of consciousness and mental activity.