Which of the following activities would be considered an economic activity?

The activity of buying gum is classified as an economic activity because it involves a transaction that affects the economy through the exchange of goods and services. Economic activities typically encompass actions that involve the production, distribution, and consumption of goods, leading to the allocation of resources within an economy. When someone buys gum, they are participating in the marketplace, contributing to demand and influencing supply.

In contrast, activities like brushing teeth, eating breakfast, or going to class do not directly involve a market transaction or economic exchange. While they may have personal importance and can involve consumption of goods (like food), they do not exemplify economic activity in the sense of engaging in a market transaction that contributes to the overall economic structure. Thus, buying gum is the only option that exemplifies an economic activity by involving a clear exchange in the marketplace.