Which of the following studies is linked most directly to the establishment of the national research act in 1974 and ultimately to the belmont report and federal regulations for human subject protection?
a. the public health service tuskegee study of untreated syphilis in the negro male. b. stanford prison experiment (zimbardo).c. the harvard t3 study. d. tearoom trade study (humphreys).

Option (A) is correct.

Explanation:

National Research Act was signed came into existence in 1974 thereby creating a Commission for the Protection of Subjects of Medical and Behavioral Study. They recognized several basic principles in accordance with research and pondered upon ways through which these principles can be followed.

The Tuskegee Study of Untreated Syphilis in African-American Male is known to be one of the most egregious and immoral clinical study, which was conducted in 1932 and so on by the State Health Service. The so called aim of this research was to examine the state of untreated syphilis; the subject in this study were given false hope that they'll receive free health care from the federal government.

b. the american revolution