What does the story of Ruth and Boaz primarily illustrate about God's character and plan?

A God's exclusive focus on the Israelite nation, excluding Gentiles from His favor. B God's meticulous provision and redemptive work, extending even to those considered outsiders. C The importance of strict adherence to legalistic interpretations of Mosaic Law. D The inherent superiority of Israelite culture and customs over Moabite traditions.