Which of the Following Is Cited as Evidence Supporting the Viral

Which of the following is cited as evidence supporting the viral infection theory of schizophrenia?

A) Schizophrenia is more common in children whose parents are also schizophrenic.
B) Approximately two-thirds of the people with schizophrenia had biological fathers who were over 45 years of age when they were conceived.
C) Schizophrenia occurs more often in people who were born during the winter and spring, when influenza and upper respiratory infections are most common.
D) Schizophrenia is more common among people who live in northern latitudes, where there is much less sunlight during the winter and spring.