Concept:An indifference curve shows different combinations of two goods that give a consumer the same level of satisfaction.Explanation:When a consumer receives equal satisfaction from two combinations of goods, those combinations lie on the same indifference curve.Each point on the curve represents a mix of two commodities that provides identical total utility.The consumer is indifferent between these combinations because none is preferred over the other.Therefore, the combination of two commodities yielding the same satisfaction is described by an indifference curve.Answer:B. indifference curve