A) Primary Source since that person experienced that event directly
The correct answer is World War II
Following World War II, the United Nations were found with a goal of preventing such monstrosities in the future.
They were first mentioned by the political philosopher John Locke. He was very influential for the founding fathers who based the ideas of rights that are self evident on his philosophy. According to him, the natural rights were those of life, liberty, and property, a bit different than what ended in the final documents.
