Considering the cultural context of ancient Israel, what might be the symbolic importance of the practice of gleaning, as exemplified by Ruth in the fields of Boaz?

A It was primarily a way for landowners to dispose of excess grain that they could not store properly. B It served as a social safety net, providing a means of survival and dignity for the poor, widows, and foreigners, reflecting God's concern for the marginalized. C It was a form of taxation levied on landowners to support the priestly class and maintain the temple. D It was a competitive activity designed to encourage hard work and resourcefulness among the lower classes.