Correct option is B
· (A) Qui facit per alium facit per se → (IV) The act of an agent is the act of the principal.
· (B) Volenti non fit injuria → (III) Voluntary consent to suffer some harm.
· (C) Damnum sine injuria → (II) Damage without the violation of a legal right.
· (D) Respondeat superior → (I) Let the principal be liable.