The United States' use of nuclear weapons to end World War II led to a determined effort by the Soviet Union to acquire those weapons, leading to a long-running nuclear arms race between the two superpowers. The Soviet Union conducted its first nuclear test in 1949.
B. Seems to be the best answer, its the only one that has to do with actually preventing disputes internationally.
It is known as a quest because of the main character, Frodo, goes on a quest to destroy the ring.