In the book of Ruth, Boaz is commended for his actions towards Ruth. What specific cultural practice did Boaz uphold by marrying Ruth?

A The practice of levirate marriage, ensuring the continuation of the deceased husband's family line. B The tradition of offering hospitality to strangers and foreigners entering the community. C The custom of providing financial assistance to widows struggling to survive. D The ritual of sacrificing a lamb to atone for the sins of the deceased husband.