Which miracle performed by Elisha is most debated regarding its historical plausibility due to its seemingly excessive nature?

A Multiplying the widow's oil (2 Kings 4:1-7) B Raising the Shunammite woman's son (2 Kings 4:32-37) C Causing an iron axe head to float (2 Kings 6:1-7) D Cursing the youths who mocked him, resulting in their mauling by bears (2 Kings 2:23-25)