Which of the Following Claims About the Human Subjects of the Tuskegee

Which of the following claims about the human subjects of the Tuskegee syphilis study is true? The subjects

A) Were infected with syphilis to test different methods of prophylaxis
B) Had syphilis when enrolled, but were not treated, even after the advent of penicillin
C) Had syphilis when enrolled and were treated when penicillin became available
D) None of the above