The Biological Weapons Convention (BWC) was held in:

1972

The correct answer is option (2) - 1972

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

NOTE: The Chemical Weapons Convention (CWC) was adopted in 1992 and entered into force in 1997.