The Tuskegee Syphilis Study Violated Several Ethical Principles in Which

The Tuskegee Syphilis Study violated several ethical principles in which way?

A) Coercion of subjects to participate in the study in exchange for treatment
B) Failing to inform subjects about the purpose and procedures in the study
C) Failing to inform the Centers for Disease Control about the results of the study
D) Not informing the subjects' physicians that they were in the study