Which of the following phrases describes a custom?

The phrase that describes a custom is "a way of acting." Customs are established practices or traditions that are accepted and followed by a particular group or society. They often arise from cultural norms and can encompass behaviors, rituals, or social conventions that guide how individuals interact within their community.

While customs can influence regulations, agreements, and laws, they are fundamentally rooted in the behaviors and practices that people engage in over time. This distinguishes them from the other options listed, which refer to more formalized structures. Regulations are specific rules set by authorities for governance, formal agreements are legally binding contracts between parties, and established laws are codified standards enforced by governmental power. In contrast, customs are informal and evolve based on social acceptance rather than legislative or contractual processes.