The president become a law and has to sign it
The First Amendment of the United States Constitution declares, "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.
C. a legislative initiative.
Only Congress itself can introduce legislation for consideration and voting into law. However, much of the legislation that worked on by Congress done at the request of the Executive Branch. If you think of the sorts of things a president outlines in his annual State of the Union message, he often will set priorities and then task Congress to take up those priorities.