Option A -> War is a geopolitical event causing inflation - this is a geopolitical challenge.
Option B -> Unstable government causing economic fluctuations - this is a geopolitical challenge.
Option C -> Economic sanctions impacting Balance of Payment - this is a geopolitical challenge.
Option D -> Firm failure reducing profits is a microeconomic/business issue, NOT a geopolitical challenge.
Hence, Option 3: (A), (B) and (C) only -> Geopolitical challenges refer to economic impacts arising from political tensions, conflicts, governance issues, and international relations between nations. Statements A (war-induced inflation), B (government instability affecting economy), and C (international sanctions) all stem from political and international relations issues. However, D represents a firm-level business failure which is a microeconomic issue unrelated to geopolitics. Therefore, only A, B, and C represent geopolitical challenges -> correct