The correct answer is: "preference".
Preferences are one of the main mechanisms that shape individual decision-making in economics, together with the amount of budget available. Consumers decide between two goods depending on whether they can afford or not their price (for example, if these pertained to different brands and are priced differentely) and their individual preferences, which are connected to the utility or amount of satisfation that the product brings to the consumer. Hence, preferences and budget are the main components which are used to build the individual demand functions in economic theory.
