Explanation

Option D is correct: Governor-General Lord Richard Wellesley founded Fort William College at Calcutta in 1800 with the specific objective of training British civil servants (covenanted civil servants) recruited by the East India Company for administrative governance in India.

– Wellesley recognized that young recruits straight from Britain needed systematic instruction in Indian vernacular languages (Hindustani, Persian, Bengali, Marathi, etc.), local customs, Hindu and Islamic jurisprudence, and administrative conventions to manage expanding territorial domains effectively.
– The Court of Directors in London disliked the imperial expenditure and independence of the college, eventually ordering its scale to be reduced and founding Haileybury College in England (1806) for initial institutional training.

Hence, the primary reason was to train British civilians for administrative purpose in India — Option D.