What best states Luther's basic doctrine?

Luther's basic doctrine emphasizes justification by faith alone, asserting that salvation is a gift from God that cannot be earned through works. He believed that individuals are saved through their faith in Jesus Christ, rather than through adherence to church rituals or doctrines. This principle was central to the Protestant Reformation, challenging the Catholic Church's practices and teachings of the time. Luther also stressed the authority of Scripture over church traditions, advocating for personal interpretation of The Bible.