The correct option is D 1799
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Tippu’s rejection of the inhuman treaty imposed upon him started the Fourth Anglo-Mysore War in 1799 CE. The British successfully destroyed the fort of Srirangapatnam. Tippu died fighting in the battle. After his death, the British Army seized 600 launchers, 700 serviceable rockets, and 9,000 empty rockets at Tippu’s fort.