What is the significance of the unnamed Levite's concubine's tragic story in Judges 19, beyond being a shocking account of violence?

A It primarily serves to highlight the importance of hospitality in ancient Israel. B It demonstrates the strength and effectiveness of the Israelite legal system at the time. C It illustrates the moral and social decay during the period of the Judges, highlighting the absence of a central authority and the resulting lawlessness. D It provides a justification for the subsequent establishment of the monarchy in Israel.