The terms CTBT, CWC and FMCT are related to which of the following fields?

CTBT (Comprehensive Nuclear-Test-Ban Treaty), CWC (Chemical Weapons Convention), and FMCT (Fissile Material Cut-off Treaty) are all international arms control and disarmament treaties aimed at reducing weapons of mass destruction. CTBT bans nuclear testing, CWC prohibits chemical weapons, and FMCT seeks to prevent production of fissile material for nuclear weapons. They are not related to trade, commerce, or nuclear testing alone - they are comprehensive disarmament instruments.