Considering the socio-cultural context of the Old Testament, what was the primary significance of Boaz's actions towards Ruth in the book of Ruth?

A To simply provide her with food out of compassion. B To publicly declare his romantic interest in Ruth, regardless of societal norms. C To fulfill his role as a kinsman-redeemer (goel) and ensure the continuation of Naomi's deceased husband's family line. D To challenge the existing social hierarchy by marrying a Moabite woman.