The correct answer is option 'B', Quasi Contract.

Explanation:
- A quasi contract is a legal concept that is applied by the court in order to prevent unjust enrichment.
- It is not a true contract as it lacks the mutual consent of the parties involved. Instead, it is an implied contract that is imposed by the court in order to prevent unjust enrichment.
- Quasi contracts are based on the principles of equity, justice, and good conscience.
- These contracts are created by the court when there is no express contract between the parties involved, but one party has received a benefit at the expense of the other party.
- The court steps in to create a quasi contract in order to ensure fairness and prevent one party from being unjustly enriched at the expense of the other party.
- Quasi contracts are also known as contracts implied in law.
- The main objective of a quasi contract is to prevent unjust enrichment and to restore the parties to their original position before the benefit was received.
- The court will calculate the value of the benefit received by one party and require that party to compensate the other party for the value of the benefit.
- Quasi contracts are not based on the intention of the parties, but rather on the principles of equity and fairness.
- They are a way for the court to provide a remedy when there is no express contract between the parties but one party has received a benefit at the expense of the other party.
- Quasi contracts are a common law concept and are recognized in many jurisdictions.
- They are an important tool to ensure fairness and prevent unjust enrichment in situations where there is no express contract between the parties.