In the narrative of 2 Kings 5, Elisha's instructions to Naaman to wash in the Jordan River highlight which important theological principle?

A The necessity of elaborate rituals for divine healing. B The accessibility of God's grace and power to all people, regardless of nationality or social status, through simple acts of obedience. C The superiority of Israelite rivers over those of other nations. D The importance of physical cleanliness for spiritual purity.