The correct option is C Tippu rejected a new treaty imposed on him.
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Lord Wellesley, the Governor-General of India, intensified political actions against Tippu after the Third Anglo-Mysore War. Tippu attempted to form alliances with local rulers and the French, which angered the British - they knew that such an alliance would threaten their existence on Indian soil. A new treaty containing inhuman and impractical conditions was imposed on Tippu. Tippu rejected this. His refusal started the Fourth Anglo-Mysore War.