The correct option is D Sinhala
The Sinhala Only Bill, formally known as The Official Language Act 1956 passed by the government of Ceylon (Sri Lanka) made Sinhalese the official language of the country. Sirimavo Bandaranaike then PM of Sri Lanka realized her campaign promise by passing the Bill, an agenda which won her 1956 general elections. This decision was violently opposed by Tamil speaking minority and the passage of bill followed rioting.