Which of the Following Describes the Theory of Joint and Several

Which of the following describes the theory of joint and several liability?

A) When multiple defendants act together to injure the plaintiff, all defendants are liable for the harm.
B) But for the defendant's actions, the plaintiff's injury would not have happened.
C) When multiple defendants combine to injure the plaintiff, a single defendant is liable if his or her actions were a substantial factor in producing the harm.
D) None of these choices.