The correct option is A Hyder Ali attacked Arcot.
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With the help from Nizam of Hyderabad, Hyder Ali of Mysore attacked Arcot in 1767 CE. The king of Arcot already had an alliance in place with the British; this incident triggered the First Anglo-Mysore War. Both the sides suffered a few setbacks. Haider reached till Madras, which drove the British into a panic mode; they were forced to enter into an agreement - the Madras Treaty - in 1769 CE.