From the interaction of the men, the reader can conclude that horatio is

Traditionally, editors of Shakespeare's plays have divided them into five acts. None of the early texts of Hamlet, however, were arranged this way, and the play's division into acts and scenes derives from a 1676 quarto. He is wearing black because it has been only two months since his father, Hamlet senior the ghost on the battlements, died and he still is mourning his father's death. To further upset Hamlet, Claudius' new bride is Hamlet's mother, Gertrude.

The third answer is correct.