Which of the following is considered a voluntary responsibility of a citizen?

Voting is considered a voluntary responsibility of a citizen because participation in elections is a choice, not a legal obligation. While citizens are encouraged to vote as a way to express their preferences and engage in the democratic process, it is not required by law. This sets voting apart from the other options listed. For instance, paying taxes is a legal requirement for citizens to support government functions. Serving on a jury is also mandated for eligible citizens when summoned, as it is a civic duty that helps ensure a fair legal process. Obeying the law is fundamental for maintaining order in society and is not something that can be chosen or opted out of. Therefore, voting stands out as a voluntary way for citizens to participate in their governance and community affairs.