Considering the cultural context of ancient Israel, what was the primary significance of the act performed by Ruth in Boaz's threshing floor, as described in the Book of Ruth?

A A simple request for food and shelter due to her poverty. B A demonstration of her skills in agriculture and her desire to work for Boaz. C A formal request, according to custom, for Boaz to fulfill his duty as a kinsman-redeemer. D An attempt to seduce Boaz, driven by her desperation to remarry.