Which of the Following Findings Led to the Conclusion That

Multiple Choice

Which of the following findings led to the conclusion that schizophrenia may be caused by dopamine activity?

A) Parkinson's disease is known to be caused by excess levels of dopamine.
B) People with Parkinson's disease are more likely to develop schizophrenia.
C) Drugs that relieve schizophrenic symptoms have side effects similar to Parkinson's disease.
D) All of the above are correct findings.