Tangibility level classification includes three classes of products: durable goods, non-durable goods, and services. Non-durable goods are those goods bought frequently and consumed in a while such as newspaper, bread, and water. Durable goods are those goods purchased less frequently and used in a longer period of time such as refrigerator, carpet, and mobile phone. Services refer to intangible marketing elements such as education, banking, insurance and airline services. B is the right answer.