In the book of Ruth, Boaz's actions extend beyond simple kindness. What legal and cultural practice did Boaz fulfill by marrying Ruth, the widow of Mahlon?

A He was fulfilling the role of a prophet, as he was known for his wisdom. B He was acting as a kinsman-redeemer, ensuring Naomi's family line and inheritance continued. C He was simply providing Ruth with a home out of pity, as she was a foreigner. D He was establishing a new religious tradition for the harvest season.