A person supplying necessaries to an incompetent person (such as a minor or lunatic), is entitled to be reimbursed from the property of such person on the basis of

The correct answer is: B. quasi-contract.

A quasi-contract is a legal obligation that arises from the unjust enrichment of one party at the expense of another. In the case of a person supplying necessaries to an incompetent person, the person supplying the necessaries is considered to have been unjustly enriched because they have provided goods or services to the incompetent person without receiving any compensation. The incompetent person is then considered to be under a legal obligation to reimburse the person who supplied the necessaries.

A valid contract is a legally binding agreement between two or more parties. A voidable contract is a contract that is legally binding, but one party has the option to cancel the contract. A contingent contract is a contract that is not binding until a certain event occurs.

In the case of a person supplying necessaries to an incompetent person, there is no valid contract between the person supplying the necessaries and the incompetent person. This is because the incompetent person is not legally capable of entering into a contract. However, the