The correct option is "Only two pairs," specifically Argentina and Sudan, as both countries are indeed facing significant challenges as described. Argentina's worst economic crisis is characterized by hyperinflation and sovereign debt issues, while Sudan is embroiled in civil conflict between military factions. Conversely, the assertion regarding Turkey rescinding its NATO membership is incorrect; Turkey remains a NATO member, despite various tensions within the alliance. Understanding such geopolitical dynamics is crucial for UPSC candidates, as it reflects the interplay of economic, social, and military factors in current affairs, which are essential components of the General Studies curriculum.