Question

If an adjective ends in an "o," you change it to an ______ before adding the adverbial ending.

1) a
2) e

Answer 1

You change the "o" to an "a" then add the adverbial ending. So number 1 XD

Answer 2

Hi !!

To form an adverb, the suffix -mente is added to the end of a feminine singular form of the adjective.

If the adjective ends in an -o, the -o is changed to an -a

exemples =

nuevo ==> nueva => nuevamente

rápido ==> rápida => rápidamente

fácil => fácilmente

breve => brevemente

final ==> finalmente

hoping this helped :)