A) The Prefrontal Cortex, the Amygdala, and the Brainstem
B) The Posterior Cingulate Cortex, the Primary Visual Cortex, and the Temporal Lobe
C) The Parietal Lobe, the Prefrontal Cortex, and the Posterior Cingulate Cortex
D) The Prefrontal Cortex, the Posterior Cingulate Cortex, and Primary Visual Cortex

A) They begin to signal a shift towards sleep in a rhythmic way as the evening progresses from light to darkness
B) They shift during adolescence, with the typical adult circadian rhythm pattern shifting forward in time, thus the time for high alertness moves from 10 am for adults to 8 am for adolescents
C) They are referred to as Process S in the Two-Process Model for Sleep-Wake Regulation
D) All of the above.

A) The amygdala
B) The basal ganglia
C) The hippocampus
D) Area MT in visual cortex