The Incidence of Schizophrenia May Vary as a Function of Season

The incidence of schizophrenia may vary as a function of season because

A) birthing during the winter represents a stressor that impairs dopamine function.
B) a fetus born during the late summer is more likely to have experienced a viral infection during the second trimester.
C) immune function is generally enhanced during the winter months.
D) a fetus born in late winter may be exposed to a viral infection during the second trimester.
E) people are more likely to be outdoors during the early fall leading to greater risk of viral infection.