The Nuclear Non-Proliferation Treaty is best described as __________. A. a treaty signed by 190 countries whose goal is to limit the spread of nuclear weapons B. a treaty signed by five countries after World War II pledging not to use nuclear weapons C. a treaty signed by the US and Soviet Union to freeze the number of ballistic missiles D. a treaty signed by the US and North Korea to reduce the number of nuclear warheads Please select the best answer from the choices provided.