The correct answers are: Contributory negligence and volenti non fit injuria.
Contributory negligence is a partial defence to liability where the defendant proves that the claimant contributed to their injury in some way.
Volenti non fit injuria is a defence created by the claimant's voluntary, express or implied acceptance of the risk.
Novus actus intervieniens refers to how the chain of causation can be broken, it is not a defence to negligence.
Accidental negligence is a fictitious term.
