Which miracle performed by Elisha is most debated regarding its actual supernatural nature versus a possible natural explanation, considering the context of the time?

A Making an iron axe head float (2 Kings 6:6) B Cursing the youths who mocked him, resulting in their mauling by bears (2 Kings 2:24) C Purifying the water supply of Jericho (2 Kings 2:21-22) D Raising the Shunammite woman's son from the dead (2 Kings 4:32-37)