Which of the Following Mechanisms Is Accurate in Describing the Effect

Which of the following mechanisms is accurate in describing the effect of sunlight on seasonal affective disorder (SAD) ?

A) Sunlight is conveyed via the retina to the pineal gland that blocks conversion of serotonin to melatonin.
B) Sunlight stimulates the hypothalamus, which causes melatonin to be released into the blood stream.
C) Sunlight is directly connected to the cerebrum via neuro pathways resulting in suppression of serotonin.
D) Sunlight is blocked by the retina from entering the neuro pathways resulting in activation of melatonin production.