Final answer:
Prenatal viral infections have been linked to an increased risk of developing autism and schizophrenia.
Step-by-step explanation:
Evidence suggests that prenatal viral infections can contribute to:
- A) Autism: A study showed that prenatal influenza may be linked to an increased risk of developing schizophrenia, which is associated with impaired social skills.
- B) Schizophrenia: Prenatal influenza has been implicated in the etiology of schizophrenia. Adoptees with a genetic predisposition for schizophrenia were more likely to develop the disorder when raised in a disturbed environment.
- C) ADHD: There is no direct evidence linking prenatal viral infections to ADHD.
- D) Bipolar disorder: There is no direct evidence linking prenatal viral infections to bipolar disorder.