What legal term describes Mary's actions when she signs her rights in the contract over to her sister Tina?

The correct term for Mary's actions when she signs her rights in the contract over to her sister Tina is assignment. In legal contexts, an assignment involves transferring one's rights or benefits under a contract to another party. When a person assigns their rights, they are allowing someone else to receive the benefits or benefits from the contract as if they were the original party.

In this scenario, Mary is relinquishing her rights to Tina, which means Tina will now have the ability to enforce or benefit from the contract, reflecting the nature of assignment. It's important to note that assignment typically pertains to the transfer of benefits or rights, distinguishing it from other legal concepts.

Understanding the distinctions among the other terms is also useful. Substitution refers to replacing one party with another in a contract, which isn't what is happening in this case. Delegation involves transferring obligations from one party to another while retaining some rights, which again doesn’t apply here as Mary is only transferring her rights to Tina. Agency pertains to a relationship where one individual acts on behalf of another, which doesn't align with the act of merely signing over rights in a contract. Thus, assignment accurately captures the action being described.