Concept:A legally enforceable agreement is defined as a contract.Explanation:A contract is a legally binding agreement between two or more parties.It can be enforced in a court of law if any party fails to fulfil their part.An offer, consideration, and acceptance are essential components required to form a contract.However, these elements alone are not the enforceable agreement itself.Only when all the essentials are present does the agreement become a valid contract.Answer:C. a contract