Considering the cultural context of the Old Testament, what was the primary purpose of the kinsman-redeemer (Hebrew: goel) as illustrated in the Book of Ruth?

A To ensure the economic prosperity of the city of Bethlehem. B To maintain tribal purity and prevent intermarriage with foreign nations. C To preserve the family line and property of a deceased relative, providing security for widows and orphans. D To serve as a legal advocate in disputes within the community.