Answer:
The correct answer is easily.
Step-by-step explanation:
Adverbs are words in a sentence that are used to modify the meaning of the verb and the rest of the words. The various types of adverbs that exist are: Time, place, quantity, mode, affirmation, denial and doubt.
Simple adverbs are those that are only made up of one word.
In this case the adverb is easily, and it is modifying the verb "passed". It is common to find adverbs that end in "ly". But be careful, not all words ending in "ly" are adverbs.