How does the concept of 'koinonia' (fellowship) in the book of Acts challenge individualistic notions of faith prevalent in contemporary Western culture?

A It emphasizes personal piety and private devotion as the primary expressions of faith. B It highlights the importance of hierarchical church structures and centralized authority. C It promotes a communal lifestyle characterized by sharing resources, mutual support, and a shared identity in Christ, contrasting with self-reliance. D It advocates for strict adherence to legalistic interpretations of Old Testament laws.