The correct answer is Kerala and West Bengal. Both states have been recognized for relatively successful implementation of land reform measures, although the extent and impact of these reforms are subject to ongoing academic debate.

Kerala's land reforms, initiated post-independence, focused on tenancy abolition, land redistribution, and the development of cooperative farming. While challenges remain, these efforts significantly altered land ownership patterns and contributed to a more equitable distribution of land resources, though not perfectly.

Similarly, West Bengal's land reforms under the leadership of Chief Minister B.C. Roy and later Jyoti Basu implemented a series of measures aimed at addressing land inequality. These included tenancy abolition, ceiling on land holdings, and efforts towards cooperative farming. The success of these measures has also been debated, with some highlighting their impact on agricultural productivity and others pointing to limitations and ongoing inequalities.

It's crucial to note that the effectiveness of land reforms is a complex issue and the success varies across regions even within these states. Other states listed, like Andhra Pradesh, Uttar Pradesh, Tamil Nadu, and Gujarat, have also undertaken land reform initiatives, but their effectiveness is generally considered less impactful compared to Kerala and West Bengal.