Given below is a statement of legal principle followed by factual situation. Apply the principle to the facts and select the most appropriate answer.
Principle: The object of an agreement is lawful unless it is forbidden by law; is of such a nature that, if permitted, it would defeat the provisions of any law; is fraudulent; involves or implies injury to the person or property of another person; the court regards it as immoral; it is opposed to public policy. A and B entered into a contract, whereby A agreed to get married to B, if her parents paid A Rs.1,00,000 before the wedding. B's parents failed to pay the promised amount. A sues B and her parents.