Moses v. Macferlan (1555-1774) is a case relating to

Solution(By Examveda Team)

Moses v. Macferlan is a landmark case in the realm of contract law. It is relevant to the concept of unjust enrichment. The case deals with the restitution of money paid under a void contract, where one party has received a benefit but is not entitled to keep the money due to the invalidity of the contract.

Option A is correct:
A. Theory of unjust enrichment
The case of Moses v. Macferlan contributed significantly to the development of the theory of unjust enrichment, which is based on the principle that a person should not retain a benefit that is unjustly acquired at the expense of another.

Options B, C, and D are incorrect:
B. The right of lien - The right of lien refers to the right of a person to retain possession of another person's property until a debt owed to the possessor is paid.
C. Test of agency - The test of agency is concerned with determining the legal relationship between a principal and an agent, where the agent acts on behalf of the principal.
D. Doctrine of frustration - The doctrine of frustration relates to situations where an unforeseen event occurs, rendering the performance of a contract impossible or radically different.

Therefore, the correct answer is:
A. Theory of unjust enrichment