Correct answer: B. Selective restriction and unequal use of rights
Explanation: A security rule can be legitimate only when it is based on law, supported by relevant reasons, and applied without political discrimination. If meetings of critics are banned while similar meetings of supporters continue, the stated security reason is being used selectively. The government is treating people differently because of their political position rather than applying one fair standard. This can chill free speech, peaceful assembly, and opposition activity.
Option B is correct because it identifies both the unequal method and the unfair use of rights. Voting age, election symbols, and the voter list do not describe the issue. Even a genuine security concern does not give officials permission to suppress only one side. Authorities should explain the rule, apply it consistently, and allow lawful review. Therefore, selective restriction and unequal rights enforcement are the central democratic problems.