Sea glass, which may come from glassware lost in shipwrecks and natural disasters, is a treasure to collectors.

Determine if the underlined clause is functioning as an adjective or adverb, then determine if it is essential or

nonessential

adjective, nonessential

adverb, essential

adjective essential

adverb, nonessential

its B

The answer from the passage is:

adverb, essential

Explanation:

Although the text does not show the underline it is clear from the passage with hit and trial method that there are no non-essential adverbs or adjectives in place in this paragraph.

One can only find adverbs along with the essentially thus mentioned, although the text has many flowery adjectives.

The grammatical connotation here conveys that the 'treasure to collectors' phrase here is thus an adverb and with the sentence structure it can be deduced it is essential.