What Did Nazi Concentration Camp Experiments and the Tuskegee Syphilis

What did Nazi concentration camp experiments and the Tuskegee syphilis experiment have in common?

A) Researchers inflicted deliberate harm on research subjects.
B) Research subjects signed informed consents,but didn't understand them.
C) Researchers failed to share their findings in a manner that would benefit society.
D) Researchers promised to follow the Belmont Report principles,but then didn't.