Consider the following countries : I. Austria II. Bulgaria III. Croatia IV. Serbia V. Sweden VI. North Macedonia How many of the above are members of the North Atlantic Treaty Organization?

Option (B) is correct because Bulgaria, Croatia, North Macedonia, and Sweden (which joined in 2024) are NATO members, while Austria and Serbia maintain official policies of military neutrality. Option (C) is a common pitfall if candidates assume Austria’s EU membership implies NATO status, or if they are unaware that Serbia remains a non-member. This question tests the core concept of international security architecture and the recent geopolitical expansion of the North Atlantic Treaty Organization in Europe.