The correct answer is; "What proof the tripster is able to provide".
That´s because as a reporter, he must make sure about the authenticity of the accusation as he cannot post apocryphal news.
I think it would be To Whom It May Concern, because you don't know their relationship status (if that makes any sense)
I could be wrong though...
The answer is B-
Mark Antony repeats that line to discredit Brutus by giving examples that prove that Caesar was not ambitious.
He's assuring Parliament that his new policy will consist of nothing less than "to wage war, by sea, land, and air."