Final answer:
None of the provided historical figures directly abolished the Zamindari system, which was eliminated through Indian government land reforms after 1947. The options reference significant individuals in Indian history, but their achievements do not encompass the abolishment of the Zamindari system.
Step-by-step explanation:
The Zamindari system was an aspect of feudal land ownership in South Asia, where tenants farmed the land and paid rents to the landlords, known as Zamindars. When we consider historical figures in context with the abolition of the Zamindari system, none of the options provided (a. Banda Singh Bahadur, b. Guru Gobind Singh Ji, c. Wazir Khan, d. Bahadur Shah I) directly relate to its formal abolishment. The Zamindari system persisted well into the modern era and was eventually abolished after India gained independence, specifically through land reform policies enacted by the Government of India after 1947, which were not the work of any single ruler from the earlier historical periods mentioned in the options. Based on the given context, if we are to pick a figure who showed progressive attitudes towards land and religious harmony, Option d. Bahadur Shah I stands out as he made efforts to improve relations with his Hindu subjects by abolishing the jizya, the tax imposed on non-Muslims. However, this action was about tax policy and did not directly abolish the Zamindari system. Guru Tegh Bahadur, mentioned in the reference, was a Sikh leader executed by Aurangzeb, so he is related to the subject through historical context but not for the abolition of the Zamindari.