Chris Turned in a Paper on the Benefits of Organically

Multiple Choice

Chris turned in a paper on the benefits of organically raised produce; however, he lost points because his references included several articles that quoted data from other studies What was Chris's error?

A) He chose references that were not primary sources.
B) The research was not conducted by a scientist.
C) The references he chose included funding source bias.
D) The research was not supported by reputable organizations.