Concept:A state is uniquely distinguished by its ability to enforce its will through legitimate force.Explanation:Within a given territory, only the state has the recognised authority to make and enforce laws.It alone can use physical coercion or violence to maintain order and compel obedience.Other groups like families, schools, or churches do not possess this lawful monopoly.Hence, the distinctive attribute of a state is the monopoly of violence.Answer:C. violence