Signing a petition in support or opposition to legislation demonstrates which constitutional right?

Signing a petition in support or opposition to legislation demonstrates the First Amendment right, which protects several fundamental freedoms, including the freedom of speech, the right to assemble, and the right to petition the government for a redress of grievances. This means individuals have the right to express their opinions about legislation and advocate for changes in laws or policies through petitions. The act of signing a petition is a direct exercise of one's ability to influence government action, showcasing the democratic principle that citizens can voice their concerns and desires regarding public matters.

While the right to assemble is also covered under the First Amendment, it specifically refers more to gathering in groups for peaceful meetings or protests. The Second Amendment pertains to the right to bear arms, and the right to privacy is not directly linked to the act of petitioning. Therefore, the First Amendment is the most accurate answer to encapsulate the action of signing a petition as an exercise of constitutional rights.