In the book of Ruth, beyond the love story, what legal and cultural practice does Boaz's actions exemplify, providing security and continuation for Naomi's family?

A The law of gleaning, ensuring the poor had access to food. B The practice of levirate marriage and kinsman-redeemer, providing an heir for the deceased and redeeming lost property. C The tradition of offering sacrifices for the forgiveness of sins. D The custom of providing hospitality to strangers and travelers.