The words "racket," "sauntering," and "smirked" suggest a tone that implies the narrator considers the adventure a joke. "Racket" indicates noise or chaos, "sauntering" suggests a relaxed or carefree attitude, and "smirked" conveys a sense of irony or amusement. Together, these words paint a picture of someone who is not taking the situation seriously, thereby implying a lighthearted or dismissive attitude toward the adventure.
So the correct response is: They imply the narrator considers the adventure a joke.