Based on the passage, the most accurate predection is B.
The Tragedy of Hamlet, better known as just Hamlet, a play by William Shakespeare sometime around 1599 and 1602, tells about the inner battle that Hamlet, the prince of Denmark, must face when he has to choose between avenging the death of his father against his uncle Claudius, who has killed his father and married his mother, thus usurping the throne, or not doing anything. In essence, the fear of death, the question of whether revenge is worth facing, the question of suicide and its consequences, and the question itself of the consequences of revenge and of killing, mix together in a soliloquy that arises after Hamlet comes face to face with the ghost of his deceased father, who is demanding revenge by him. Hamlet, agrees with his father´s ghost to kill his uncle and starts to create a secret plan to exact his revenge while acting is if he has gone mad. Even if in the end what comes out from the contemplations is an evidence of the fear Hamlet has regarding killing someone and even contemplating suicide and the consequences of such an act, the truth is that all of this shows Hamlet´s desire and final decision to exact revenge against his uncle for the death of his father. This is why the correct answer would be C.
Hamlet was who they agreed they must tell about the ghost
