Final answer:
Annette is an advocate because she is actively supporting a cause to preserve a local park by collecting petition signatures, which is a form of political participation. So the correct option is a.
Step-by-step explanation:
When Annette spends her Saturday morning collecting signatures on a petition to preserve a local park, she is engaging in a form of political participation geared towards influencing policy in favor of conserving the park. This makes her a(n) advocate, as she actively supports and argues for the cause of preserving the park. As an advocate, Annette is adopting a normative position by holding a conviction about what should be done to achieve a specific goal or outcome, such as the preservation of public spaces. Private citizens like Annette often become advocates for issues they care about, and in doing so, utilize tools like facts, evidence, and analysis to persuade policymakers or the public.