Which one of the following would be the most credible source for Paul's paper?
О А.
a documentary about artistic movements in America from the colonial era to the present
OB. an interview with a frequent visitor at a museum that has a pop art exhibit
a dated letter written by a famous pop artist explaining his latest artwork
O D. a Web site with a collection of reviews about the different types of modern art
O E. an article written by the director of the pop art exhibit at a prestigious museum