Considering the socio-cultural context of ancient Israel, what was the primary significance of Boaz's actions toward Ruth in the book of Ruth, beyond simple kindness?

A Boaz was primarily motivated by physical attraction to Ruth. B Boaz was fulfilling his legal and social obligation as a kinsman-redeemer, ensuring the continuation of Elimelech's family line and protecting Naomi's future. C Boaz aimed to gain political power through marriage into a Moabite family. D Boaz sought to challenge the existing social norms of the time by marrying a foreign woman.