Dr.King uses the elements ethos and pathos in his argument of the American dream by being perceived as credible by his audience and using the hope and determination involved with the American Dream to persuade the audience with these emotions (Hope this helps)
I would think it would be C. The revolutionary war was mainly between the colonist in America and England, so if Historian A thinks that the war was caused by the Americans then it is likely that they are British. If historian B thinks that the war was caused by the British, then it is likely that they are American.