in a group discussion which sentence is most clearly using evidence from outside resources

A)i disagree with the notion that arthur Roy brown was responsible for shooting down the red baron; the evidence isn't there

B) although some claim that Richthofen shot 80 enemy plane down this number may have been exaggerated

C) i know that he more popularly known as the red baron, but for objective sake lets call him Manfred von Richthofen

D) Patricia Costello Argus that some of the red barons victories were due to his strong leaderships not just his flying skills