The correct option is C The Tashkent Declaration was signed in 1966 by Lal Bahadur Shastri and M A Khan to deescalate the tensions.
The Indian subcontinent was partitioned into India and Pakistan on 15 August, 1947. Unlike India's secular nature, Pakistan was created on a religious basis. Due to its Muslim-majority population of Kashmir, Pakistan claims this region as its territory and has waged several wars in the past to annex Kashmir. Despite several treaties and peace agreements, the relations between the two countries remains strained till date.