The answer here would be B. A nervous actor tries to conquer his stage fright. This battle that the actor is faced with is pitting him against himself. The conflict is happening within the actor's mind/body.
In A, the knight is fighting another being, the dragon.
In C, the traveller is trying to survive in (against) the wilderness
In D, the dog and the cat are learning to work together, but they are not fighting themselves.
