How Did the American Anthropological Association's "Do No Harm" Mandate

How did the American Anthropological Association's "do no harm" mandate come into existence?

A) Anti-colonialist ideas spurred a debate in the 1900s about the role of anthropology in protecting indigenous groups.
B) The loss of life during the Human Terrain Systems Program was made public and provoked outrage among the anthropological community.
C) An increasing awareness of loss of Amazonian rain forest populations evoked a worldwide outcry.
D) Ethical and moral lapses toward the end of the twentieth century led to changes in attitude about the role of the anthropologist.