King Birendra was killed in a mysterious massacre of the royal family in :
Correct option is D. 2001
Nepal witnessed an extraordinary popular movement in April 2006. The movement was aimed at restoring democracy. Nepal, you might recall, was one of the ‘third wave’ countries that had won democracy in 1990.
Although the king formally remained the head of the state, the real power was exercised by popularly elected representatives. King Birendra, who has accepted this transition from absolute monarchy to constitutional monarchy, was killed in a mysterious massacre of the royal family in 2001.