A landmark peace agreement that ended the armed insurgency in Mizoram was signed in the year:

1966
1976
1986
1996

The correct answer is: c) 1986.

The Mizo National Front (MNF) was an armed rebel group that fought for the independence of Mizoram from India. The MNF was founded in 1966 by Laldenga, who was the leader of the Mizo people. The MNF launched an armed insurgency against the Indian government in 1967. The insurgency lasted for 20 years and resulted in the deaths of thousands of people.

In 1986, the MNF and the Indian government signed a peace agreement. The agreement granted Mizoram statehood and ended the armed insurgency. Laldenga became the first Chief Minister of Mizoram.

The peace agreement was a landmark event in the history of Mizoram. It brought an end to the violence and bloodshed that had plagued the state for two decades. It also paved the way for the development of Mizoram and the improvement of the lives of its people.

The other options are incorrect because they are not the years in which the peace agreement was signed.