The answer is B: his eloquence.
Out of all the traits that make up Shakespeare´s immortal character, it is, without a doubt, his eloquence that makes him stand alone in the pantheon of great literary characters. One would only need to remember the lines from Act 3, scene I, where Shakespeare (through Hamlet, obviously) delivers some of the most well-known and beautiful lines ever written: “to be or not to be? That is the question”.