John Buff Picks a Fight with James Smalls

John Buff picks a fight with James Smalls. John begins to punch James in the face over and over again for no reason at all. James tries to fight back and in doing so he knocks John down on the ground where John hits his head on a rock and dies. James is arrested and charged with the murder of John. ​

A) During the above altercation, a passerby jumped in to help out James because he could easily see that John was creating a ton of damage to his face with his punches. The assistance by the passerby is referred to as:
B) self-defense.
C) defense of another.
D) social responsibility.
E) model of defense action.