The correct option is C prevention of unjust enrichment at the expense of others
Quasi contracts refer to those relations that resemble that of a valid contract (Chapter V of the Indian Contract Act, 1872). The provisions require a person to compensate the other for an act although no contract has been entered into or no tortious liability exists. It is based on the principle that no one should have an unjust benefit at the cost of the other. For example, a person receiving money twice for a sale, is under an obligation to return the excess money received although the contract does not state it.