Which of the following is NOT a right granted by the Constitution?

Social Security is not a right explicitly granted by the U.S. Constitution. Instead, it is a program established by legislation, specifically with the Social Security Act of 1935, providing financial assistance to retirees, disabled individuals, and survivors. In contrast, free speech, the right to bear arms, and freedom of religion are all articulated in the Constitution itself. Free speech is protected under the First Amendment, the right to bear arms is recognized in the Second Amendment, and freedom of religion is also safeguarded by the First Amendment. Thus, Social Security stands out as a program that is not enshrined in the Constitution, making it the correct answer in this context.