NPT signed in 1968 for purpose

The correct answer is Prevent nuclear weapon. The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) was opened for signature in 1968 and came into force in 1970. Its primary purpose is to prevent the spread of nuclear weapons and weapons technology, promote cooperation in the peaceful uses of nuclear energy, and further the goal of achieving nuclear disarmament. The treaty establishes a framework where non‑nuclear‑weapon states agree not to acquire nuclear weapons, while nuclear‑weapon states commit to eventual disarmament. The NPT is one of the most widely adhered‑to arms control treaties, with 191 states parties. The option 'Nuclear Weapon' is incomplete because the treaty is about non‑proliferation, not the weapon itself. 'Use of Atomic Reactors' refers to peaceful applications, which is not the main purpose. 'None of these' is incorrect as the purpose is clearly defined.