Final answer:
The First Amendment of the United States Constitution provides freedom of speech, religion, and the right to assemble. It is the cornerstone of American democracy and ensures these fundamental rights for all citizens.
Step-by-step explanation:
The amendment that provides freedom of speech, religion, and the right to assemble is the First Amendment to the United States Constitution. This Amendment is a cornerstone of American democracy, ensuring that citizens have the right to express their opinions, practice their religion without government interference, and gather in groups for peaceful protest and dialogue. Specifically, the First Amendment states, "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances." The correct answer to the student's question is d. 1st amendment.