Some Animals in Cold-Weather Habitats Hibernate for Long Periods of Time

Some animals in cold-weather habitats hibernate for long periods of time during the winter by sleeping in dark dens until the weather becomes warmer.How does hibernation affect melatonin secretion?

A) Hibernation does not affect melatonin secretion because the sun and moon and still rising and setting.
B) Hibernation decreases melatonin secretion because the temperature is low.
C) Hibernation increases melatonin secretion because the temperature is low.
D) Hibernation increases melatonin secretion because the animal is asleep in the dark.
E) Hibernation decreases melatonin sectretion because the animal is asleep in the dark.