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

A Boaz was primarily motivated by romantic love at first sight. B Boaz was fulfilling his legal and social obligation as a kinsman-redeemer to protect Ruth and Naomi's family line and property. C Boaz sought to exploit Ruth's vulnerable position as a foreign widow for personal gain. D Boaz's actions were merely a demonstration of common hospitality and did not have deeper significance.