The narrator of this passage is
The questions racing through the narrator's mind indicate curiosity. Answer (a teenager) is incorrect because the passage never mentions the narrator’s age. Answer (scared) is incorrect because there is no evidence of fear; the narrator simply asks questions about what’s going on. Answer (in trouble) may sound right, but that would only be an assumption. There is no clue as to whether or not the narrator is in trouble, only that he or she does not want to be caught listening.