Considering the cultural context of the time, what might be the underlying reason behind the practice of gleaning, as exemplified by Ruth in the fields of Boaz (Ruth 2:2-3)?

A It was a way for landowners to display their wealth and generosity. B It ensured that the poor and marginalized had access to food and sustenance. C It was a form of taxation imposed on landowners by the ruling authorities. D It provided employment opportunities for widows and orphans in rural communities.