The pace of the passage mainly builds suspense. As the characters transition from a moment of reconciliation and hope for rescue to the sudden realization of danger, the quickening tension in their dialogue and the urgency of their shouts create an intense atmosphere. The shift from waiting and anticipating help to the alarming revelation of wolves approaching compresses time and heightens the sense of imminent threat, making the ending both surprising and impactful. Thus, the correct response is:
It builds suspense.