What term describes a person who actively takes responsibility and tries to make a difference in public concerns?

The term "active citizen" refers to an individual who takes initiative in their community and engages with public issues to make a positive impact. This person actively participates in civic activities, advocates for social change, and contributes to discussions and actions that address community concerns. Active citizenship often involves being informed about societal issues, participating in democratic processes, and taking steps to help improve the lives of others.

In contrast, the other terms do not imply a proactive approach. A passive observer tends to watch events unfold without taking any action. A neutral bystander remains uninvolved, often choosing not to engage with the surrounding issues. An informed spectator may understand public concerns but does not necessarily act to address them. Therefore, "active citizen" is the most appropriate term to describe someone who takes responsibility and seeks to make a difference in public matters.