The correct answer is - C.) The United States, Great Britain, and the Soviet Union signed the Limited Test Ban Treaty.
The signing of the Limited Test Ban Treaty was due to the fears of another world war which would have been much more catastrophic than the previous two since the advancements in the technology skyrocketed and the weapons were much more sophisticated and with much bigger destructive power. The treaty was supposed to limit the tests and production of nuclear weapons and in time to significantly lower them in the arsenal of the countries, but that was only on paper, all three countries were not willing to practice it and continues with the development of nuclear weapons as they were in a race as to who is the biggest force on the planet.