Through custom or agreement, groups of people establish rules known as _______ to guide or restrict them in behaviors or procedures.

The correct term in this context is laws. Laws are formal rules and regulations established by a governing body or group to maintain order, protect rights, and ensure justice within a society. They are typically codified and can carry specific penalties for violations.

In the context of groups of people establishing guidelines for behavior or procedures, laws serve as a foundational framework that both governs and promotes societal norms. They arise from customs, agreements, or consensus within a community, forming a pivotal part of organized governance.

Other terms listed, such as rituals, refer to established procedures often related to cultural or religious practices, but they do not necessarily carry legal implications. Constitutions refer to foundational documents that outline the principles and organization of government but are broader in scope than specific rules governing behavior. Statutes are written laws passed by a legislative body, which can be seen as a subset of laws; they are indeed laws but do not encompass the general concept of all rules guiding behavior.