Scarcity in economics is to resource allocation as A: B is to C:? What is C?

Scarcity in economics means that there are limited resources available to meet unlimited wants and needs. This situation forces people and societies to make choices about how to use those resources effectively. When we talk about resource allocation, we are discussing how to distribute these limited resources among different uses. In this analogy, if scarcity is to resource allocation as choice is to trade-off, then C would be trade-off. For example, if a family has a limited budget, they must choose between buying groceries or going out to eat, illustrating the concept of trade-off in their decision-making.