What cultural practice, prevalent in the ancient Near East and reflected in the story of Ruth, is demonstrated by Boaz's actions in relation to Ruth and Naomi?

A The ritual of gleaning, where the poor were allowed to gather leftover crops from fields. B The Levirate marriage custom, requiring a close relative to marry a widow to continue the deceased husband's lineage. C The practice of covenant cutting, symbolizing a binding agreement between two parties. D The tradition of offering a burnt offering to atone for sins committed during the harvest.