The Tuskegee Syphilis Study Was Carried Out

The Tuskegee Syphilis Study was carried out

A) over a forty-year period, from the 1930s into the 1970s.
B) in several poor countries in Africa and Southeast Asia.
C) by private doctors and pharmaceutical companies.
D) with the full understanding by all the research subjects participating in the project that it had potential risks as well as benefits.
E) All of these are features of the Tuskegee Syphilis Study.