The correct option is C Mysore Sultans
By the second half of the 18th century the Sultans of Mysore, Hyder Ali and Tipu Sultan marched towards Kerala and led military campaigns which created frenzy among the Naduvazhis of northern Kerala. Nediyiruppu, Kola and other smaller Swaroopams quickly came under the Mysore Sultans. Thus, fearing the attack from Mysore Sultans many Naduvazhis and Desavazhis fled to Venadu.