Considering the socio-cultural context of the Old Testament, what was the primary significance of Boaz's act of 'redeeming' Ruth in the book of Ruth?

A Primarily a romantic gesture indicating his personal affection for Ruth. B A strategic move to acquire Ruth's land for economic gain. C An act of kinsman-redeemer (goel) fulfilling his legal and familial obligation to preserve Naomi's family line and inheritance. D A political maneuver to consolidate power within the Bethlehem community.