Which one of the following countries has more or less evolved a two-party system?

The correct answer is Bangladesh because for several decades, its political landscape has been dominated by two major parties: the Bangladesh Awami League and the Bangladesh Nationalist Party. While other smaller parties exist, the competition for power and the formation of government have primarily rotated between these two dominant forces. In contrast, Sri Lanka and Pakistan have historically featured more complex multi-party systems with significant reliance on various regional or smaller parties to form coalitions. Myanmar has faced prolonged periods of military rule and its democratic transitions have not resulted in a stable or evolved two-party system. Therefore, among the given options, Bangladesh most closely fits the description of a country that has evolved a two-party system.