Is the underlined word(s) a participle or a verb? read the sentence. where is that (banging) -underlined word-noise coming from? which best identifies the function of the underlined word?

The answer is definitely a Verb

i mean think about it, "banging" is a loud sound and the main meaning of verb is something like hear, become, happen, or a action. Plus, the sentence says "where is that "banging"  noise coming from"

So obviously, its something they heard, IF it were a noun it would probably be a place, thing, person.

But overall, the answer is Verb. Hope this answers your question!

answer: b) bubbling its way

explanation: an adjective is a word or a group of words that modifies a noun (name, thing, place,

in this case, the first option "to heartily enjoy" isn't describing or modifying any noun, the third option "hiking along merrily" is describing an action but it doesn't modify any noun, the last option "beside us" is just a preposition that indicates position, so the correct answer is the second one: "bubbling its way" because it is modifying the noun "stream".