The correct answer is D. 1956.
The Himachal Pradesh Land Reforms and Tenancy Act, 1956 was enacted by the Government of Himachal Pradesh to abolish big landed estates and to provide security of tenure to tenants. The Act was passed on 15 April 1956 and came into force on 1 July 1956.
The Act abolished all jagirs, inams, muafis, and other similar tenures. It also abolished the right of landlords to collect any kind of rent or revenue from their tenants. The Act provided for the redistribution of land among the tenants. The tenants were given the right to purchase the land they were cultivating at a price fixed by the government.
The Act also provided for the establishment of a Land Tribunal to adjudicate on disputes arising out of the implementation of the Act. The Act was a landmark legislation in the history of Himachal Pradesh. It abolished the feudal system of land tenure and ushered in a new era of land reforms in the state.
The other options are incorrect. Option A is incorrect because the Himachal Pradesh Land Reforms and Tenancy Act, 1956 was enacted in 1956, not 1954. Option B is incorrect because the Himachal Pradesh Land Reforms and Tenancy Act, 1956 was enacted in 1956, not 1961. Option C is incorrect because the Himachal Pradesh Land Reforms and Tenancy Act, 1956 was enacted in 1956, not 1976.