Concept:Utility is the satisfaction a consumer gains from using a product or service.Explanation:When a customer buys goods and services, they receive both physical benefits, such as comfort or functionality, and psychological benefits, such as pleasure or status.This combined level of satisfaction is called utility in economics and commerce.Production refers to making goods, product mix means the range of products offered, and trade is the exchange of goods.Only utility directly describes the satisfaction derived from consumption.Answer:C. utility