Which of the following statement is incorrect about the disarmament of the two superpowers?

Both the superpowers, the US and the Soviet Union signed the treaties to give up Nuclear Weapons.

The correct answer is Option 3 - Both the superpowers, the US and the Soviet Union signed the treaties to give up Nuclear Weapons.

• Option 1 : Both the superpowers, the US and the Soviet Union signed the Biological Weapons Convention. This statement is correct. Both the United States and the Soviet Union signed the Biological Weapons Convention to prohibit biological weapons.
• Option 2 : Both the superpowers, the US and the Soviet Union signed the Chemical Weapons Convention (CWC). This statement is correct. Both countries supported agreements related to banning and controlling chemical weapons.
• Option 3 : Both the superpowers, the US and the Soviet Union signed the treaties to give up Nuclear Weapons. This statement is incorrect. The two superpowers signed treaties to limit, reduce, and control nuclear weapons, but they did not completely give up nuclear weapons. 

NCERT: "Traditional views of security do not rule out other forms of cooperation as well. The most important of these are disarmament, arms control, and confidence building. Disarmament requires all states to give up certain kinds of weapons. For example, the 1972 Biological Weapons Convention (BWC) and the 1997 Chemical Weapons Convention (CWC) banned the production and possession of these weapons. More than 155 states acceded to the BWC and 193 states acceded to the CWC. Both conventions included all the great powers. But the superpowers — the US and Soviet Union — did not want to give up the third type of weapons of mass destruction, namely, nuclear weapons, so they pursued arms control."