The correct answer is "adverb". This is because "within the old trunk" refers to the place where it was found, not a description of the trinket itself.
Explanation:
the question given can be answered by you because it's states that "write a passage about your
favourite place " so you can just write a short passage or a long one (depends on what you're writing about )
, it's like you're describing what you've seen or done at that particular place which u favour ..
So in my opinion you should write it since it's referring or is asking you..
