Arrange the following in chronological order:
(A) Chemical Weapons Convention (CWC)
(B) The Nuclear Non-Proliferation Treaty (NPT) between USA and Soviet Union
(C) Biological Weapons Convention (BWC)
(D) Iraq’s invasion of Kuwait (First Gulf War)

BCDA

Chronological order:
(A) The Nuclear Non-Proliferation Treaty (NPT) between USA and Soviet Union -1968 
(B) Biological Weapons Convention (BWC)-1972
(C) Iraq’s invasion of Kuwait (First Gulf War)-1990
(D) Chemical Weapons Convention (CWC)-1992