The Mizo National Front (MNF) launched an armed insurgency with the aim of:

Establishing a communist state
Unification with China
Secession from India
Greater autonomy within India

The correct answer is (c). The Mizo National Front (MNF) launched an armed insurgency with the aim of secession from India. The MNF was founded in 1966 by Laldenga, who was a Mizo nationalist. The MNF wanted to establish an independent Mizoram state. The insurgency lasted for 20 years, and ended in 1986 with the signing of the Mizoram Accord. The Accord granted Mizoram statehood, and the MNF was disbanded.

Option (a) is incorrect because the MNF was not a communist organization. Option (b) is incorrect because the MNF did not want to unify with China. Option (d) is incorrect because the MNF wanted to secede from India, not greater autonomy within India.