Correct Option: B

In economics, utility is a representation of preferences over some set of goods and services. Preferences have a utility representation so long as they are transitive, complete, and continuous. Usefulness refers to which extent something is useful and the utility is the quality of that piece in practical use. Both are inter-related terms. Utility is a factor of usefulness term. Usefulness means having practical utility of a piece which is beneficial, pertinent and functional.