The most logical conclusion to the story is:
Caleb confronts Alicia, who admits her guilt and returns the money.
This conclusion is consistent with the narrative's build-up of Caleb's internal conflict regarding witnessing the theft and his eventual decision to take action. It addresses the central issue of the story—Alicia's theft—and provides a resolution that involves confrontation and accountability. The other options do not provide a direct resolution to the theft or Caleb's dilemma.