The correct answer is (c).
Operation All Out is a counter-insurgency operation launched by the Indian Army in Jammu and Kashmir in January 2015. The aim of the operation is to eliminate all militant groups operating in the state. The operation has been successful in reducing the number of militant attacks in the state.
The other options are incorrect.
(a) Naxlites are a left-wing extremist group that is active in several states in India, including Chhattisgarh. The Indian Army has launched several operations against the Naxlites, but they have not been able to completely eliminate the group.
(b) Bodo militants are a tribal group that is active in Assam. The Indian Army has launched several operations against the Bodo militants, but they have not been able to completely eliminate the group.
(d) Cross-border infiltration is the illegal crossing of the border between India and Pakistan by militants. The Indian Army has launched several operations to prevent cross-border infiltration, but they have not been able to completely stop it.