The Pardoner sells which animal’s bones as saint’s bones?

The correct answer is Pig's. The Pardoner sells pig's bones as saint's bones. This is significant because in the Middle Ages, relics were highly valued and believed to have miraculous powers. The Pardoner takes advantage of people's faith and superstition by selling them fake relics, such as pig's bones, claiming they are holy. This highlights the Pardoner's deceitful and manipulative nature, as well as the widespread corruption within the Church during that time.