In the Parable of the Persistent Widow (Luke 18:1-8), what does the judge's eventual granting of the widow's request reveal about God's nature and the purpose of prayer?

A It demonstrates that God is reluctant to answer prayers and must be worn down by persistence. B It illustrates that God only answers prayers from those who are socially disadvantaged. C It emphasizes that God is just and will ultimately vindicate his elect, even though there may be delays. D It suggests that prayer is primarily a means of manipulating God to fulfill our desires.