Select the correct answer. Clint is arguing against testing products on animals in this research paper. He needs more sources to build his argument. Which source would best add to his paper?

A.
a study from the US Department of Agriculture discussing the conditions at research facilities
B.
social media posts by animal rights activists and social media posts from a cosmetics company
C.
pictures of an animal rights protest happening in front of research facilities
D.
an interview with a CEO of a top cosmetics company who denies the use of animals in testing