The correct options are
A They waged war on Krishnappa Nayak of Mysore and Kerala Varma of Malabar.
C They captured Oomathurai and Sevathaiah.
The British took various measures to quell the second Palayakkarar war. They waged war on Krishnappa Nayak of Mysore and Kerala Varma of Malabar but were defeated. They then waged wars on Palayakkarars of Coimbatore, Sathyamangalam and Tarapuram and won. They eventually captured Oomathirai and Sevathaiah. The war ended with the Carnatic treaty of 1801.