In the narrative of King Hezekiah's illness and subsequent recovery (2 Kings 20), what deeper theological message is conveyed beyond the demonstration of God's healing power?

A It primarily serves as a cautionary tale about the dangers of pride and the importance of humility before God. B It underscores the unconditional nature of God's covenant with David, guaranteeing the survival of his dynasty regardless of individual actions. C It emphasizes the power of prayer and repentance in altering God's predetermined plans, demonstrating human agency in the face of divine decree and highlighting the importance of seeking God's will in all circumstances. D It primarily highlights the importance of consulting prophets for medical advice, as they possess superior knowledge of healing practices.