The correct options are
B Pay taxes to the Emperor of Vijayanagara.
C Rally behind the Vijayanagra empire in case of a war.
Palepattus had to pay taxes to the Emperor of Vijayanagara and if the Vijayanagara Empire was attacked by an enemy, these small kingdoms had to rally behind the Emperor. Palepattus supported the Vijayanagara Empire because the Empire protected them in return.