Which themes best represent Fortinbras as a foil for Hamlet? Select all that apply.

revengethought versus actionmadness noble behavior

In my opinion, the correct answers are A. Revenge, and B. Thought versus action.

Both Hamlet and Fortinbras are sons who have lost their fathers and feel the urge to revenge, as a precondition to ruling their countries. For Hamlet, revenge is a personal issue that he doesn't want to solve with violence. The whole Denmark expects and fears young Fortinbras' revenge. This is related to the B option, because Fortinbras' military action inspires Hamlet to undertake his own revenge. We don't see Fortinbras much, nor do we get to meet his character. But Hamlet, as a man tortured by contemplation, sees his foil as a man of action. And that is what inspires him to act.