The nuclear non-proliferation treaty is best described as

The correct answer is letter A. a treaty signed by 190 countries whose goal is to limit the spread of nuclear weapons.

Here are the choices.
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

Nigeria and south africa

None   they are   equally likely to occur on any plate boundary