What Led to the Creation of the Nuremberg Code

What led to the creation of the Nuremberg Code?

A) Nazi experimentation on Jewish people, people with disabilities, and others during the Holocaust
B) The choice of medical researchers in Alabama to deny African American men with syphilis treatment known to manage the disease in order to study how the disease progressed and killed people
C) Experiments on college students in which they were assigned the role of "prisoner" or "guard" in a fake prison, which emboldened some of them to become violent toward others
D) The practice of pharmaceutical companies to conduct more dangerous research on people in less wealthy nations, which tend to have more lax rules about experimentation than do Western nations