In which of the following country Sinhala community is in Majority?

Sri Lanka

The correct answer is Option 4 - Sri Lanka

Sinhala community is in majority in Sri Lanka.

After its independence, politics in Sri Lanka (it was then known as Ceylon) was dominated by forces that represented the interest of the majority Sinhala community. They were hostile to a large number of Tamils who had migrated from India to Sri Lanka and settled there. This migration continued even after independence. The Sinhala nationalists thought that Sri Lanka should not give ‘concessions’ to the Tamils because Sri Lanka belongs to the Sinhala people only. The neglect of Tamil concerns led to militant Tamil nationalism.