The correct answer is: a) Extrajudicial killings.
The “Secret Killings” in Assam refer to a period of extrajudicial killings that took place in the Indian state of Assam from the late 1980s to the early 1990s. The killings were carried out by the Indian security forces and paramilitary forces, and were allegedly aimed at eliminating suspected militants and their supporters. The killings were largely carried out in secret, and the victims were often buried in unmarked graves. The “Secret Killings” have been widely condemned by human rights groups, and the Indian government has been accused of failing to adequately investigate the killings.
Option b) Communal violence is incorrect because the “Secret Killings” were not motivated by religious or ethnic hatred.
Option c) Targeted attacks by insurgents is incorrect because the “Secret Killings” were not carried out by insurgents.
Option d) Natural disasters is incorrect because the “Secret Killings” were not caused by natural disasters.