ok so I'm doing this assignment where I have to write 3 paragraphs about the movie iron will and story Mazy may I already wrote the intro so i need somebody to do the body paragraph 1 please I'll give them brainliest and 5 stars and thanks

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. tearoom trade study (humphreys).d. the harvard t3 study.