In the Old Testament, what was the primary purpose of the city of refuge and how did it reflect God's justice and mercy, especially regarding unintentional acts?

A It served as a military outpost to defend against enemy attacks. B It was a place for political exiles seeking asylum from oppressive rulers. C It provided a sanctuary for those who accidentally caused a death, protecting them from blood vengeance while offering a chance for atonement. D It functioned as a center for trade and commerce, attracting merchants from distant lands.