Which of the following statements most accurately characterizes an aspect of the neurobiology of ...

Which of the following statements most accurately characterizes an aspect of the neurobiology of sleep?
 
  A)
  The hypothalamus stimulates the anterior and posterior pituitary to modulate sleeping-waking cycles.
  B)
  The pituitary releases melatonin at predictable points in the circadian rhythm in order to facilitate sleep.
  C)
  The reticular formation, thalamus, and cerebral cortex interact to integrate the sleep-wake cycle.
  D)
  Input from the retinas is interpreted by the cerebellum and contributes to maintenance of the circadian rhythm.