Which evidence from Passage 2 best supports the central idea that Arthur is destined to rule as king?

Arthur is the son of Uther Pendragon.
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Arthur swears that he will be a true king.
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Arthur is a humble stepbrother to Sir Kay.
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Arthur earns the respect of the common folk.
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Arthur is the son of Uther Pendragon.

Explanation:

The most famous version of the legend says that Arthur was the son of the famous King Uther Pendragon, whom the great sorcerer Merlin helped marry Arthur's mother. When the boy was born, he belonged to Merlin, who kept his royal ancestry secret. Years after that, Uther died and a civil war ensued in the kingdom as many nobles and knights wanted a vacant throne. As a young man, Arthur drew a sword out of stone. Legend has it that the one who drew the sword was the son of Uther Pendragon, so Arthur became king.