Which of the following statements is correct?

a- BWC and CWC included all the great powers.
b- The US and the Soviet Union agreed to give up their nuclear weapons.

Only statement a is correct.

Disarmament requires all states to give up certain kinds of weapons. For example, the 1972 Biological Weapons Convention (BWC) and the 1992 Chemical Weapons Convention (CWC) banned the production and possession of these weapons. More than 155 states acceded to the BWC and 181 states acceded to the CWC. Both conventions included all the great powers. But the superpowers — the US and the Soviet Union — did not want to give up the third type of weapons of mass destruction, namely, nuclear weapons, so they pursued arms control.