What Led to the Development of the Nuremberg Code

What led to the development of the Nuremberg Code?

A) Nazi experiments such as "freezing experiments" conducted on prisoners
B) late-twentieth-century research with borderline ethical situations such as telling part of the truth,but not the whole truth,about the purpose of a project
C) Internet studies such as the Harvard Facebook study,conducted in a new technology environment for which ethics have not been fully developed
D) military studies in nations around the world,such as the Human Terrain System,in which governments can use research findings for good or for evil