Answer:
Viral infection
Step-by-step explanation:
A leading hypothesis for the cause of schizophrenia suggests that the illness results from neurodevelopmental defects that occur in fetal life. Several early environmental factors have been suggested to increase the risk of developing schizophrenia, including viral infection during pregnancy, prenatal nutritional deficiencies, and perinatal complications, such as birth defects and neonatal hypoxia. No current research supports the theory that any of the other options are prenatal triggers of schizophrenia.