Which of the following is an explanation offered by carlson for the seasonality effect in schizophrenia? a. people are more likely to be outdoors during the early fall, leading to greater risk of a viral infection. b. a fetus born during the late summer is more likely to experience a viral infection during the second trimester. c. immune function is generally enhanced during the winter months. d. a fetus born in the late winter is more likely to have been exposed to a viral infection during the second trimester. e. birthing during the winter represents a stressor that impairs dopamine function.