In the Parable of the Persistent Widow (Luke 18:1-8), what is the primary characteristic of the judge that makes the widow's persistence necessary?

A He was known for his piety and fear of God, but was overwhelmed with cases. B He was just and fair, but adhered strictly to legal procedure and required substantial evidence. C He neither feared God nor cared about people, but eventually granted her justice to get rid of her. D He was secretly sympathetic to the widow's plight, but was bound by oath to uphold the law regardless.