You Are Writing a Report on the History of Chemical

You are writing a report on the history of chemical X in the United States.Your instructor says that all sources used for your report must be primary sources.Which of the following would you choose?

A) an interview with the scientist who created chemical X
B) a textbook from an environmental toxicity class
C) a news website story about chemical X
D) an original research article in a scientific journal about the effects of chemical X