Which part of speech is the underlined word in the following sentence?
Did youevertry to find out?

An adverb is a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. (e.g., gently, quite, then, there ).
The given word is an adverb as it modifies the verb try.
So, option 3 is correct.