How does the story of Ruth, a Moabite woman, challenge the prevailing ethnic and religious boundaries within the Old Testament narrative?

A It demonstrates the superiority of Moabite customs over Israelite law. B It highlights the importance of maintaining strict separation from foreign cultures. C It illustrates God's inclusive grace and the potential for outsiders to be integrated into the covenant community. D It serves as a cautionary tale about the dangers of intermarriage with non-Israelites.