In the book of Ruth, beyond demonstrating loyalty, what legal and cultural practice did Boaz fulfill by marrying Ruth, the Moabite widow, according to Deuteronomy 25:5-10?

A Adopting her as his daughter. B Acting as a Kinsman-Redeemer to preserve her deceased husband's family line and inheritance. C Providing her with financial support until she remarried. D Offering her refuge in his household as a sign of hospitality.