Mark Is on Trial for Murder of Victor and Has

Mark is on trial for murder of Victor and has hired Anthony, an attorney, to represent him. He claims he acted in self-defense. Mark's sister Sandy was present when the crime occurred. Anthony suggested that they call character witnesses to support Mark's claim of self-defense. Who should they call?

A) Mark's best friend
B) A psychologist who did an evaluation of Mark
C) A bartender who has seen Victor aggressively start numerous fights
D) No one - the defense is not allowed to call character witnesses