The words "racket," "sauntering," and "smirked" impact the paragraph's overall meaning primarily by indicating that the narrator considers the adventure a joke. "Racket" suggests that there was a lot of talk or commotion about the mysteries, while "sauntering" implies a casual and carefree approach to the situation. "Smirked" reflects a sense of amusement rather than fear. Together, these words convey an attitude of playfulness and a lack of seriousness toward the supposedly scary experience.
So the correct response is: They imply the narrator considers the adventure a joke.