Considering the cultural context of ancient Israel, what was the primary societal function of the kinsman-redeemer (Hebrew: go'el) as illustrated in the book of Ruth?

A To serve as a judge in legal disputes within the community. B To ensure the continuation of a family line by redeeming property and marrying a childless widow. C To act as a priest, offering sacrifices on behalf of the family. D To lead the community in military campaigns against their enemies.