In the Parable of the Persistent Widow (Luke 18:1-8), what does Jesus emphasize is being contrasted by the unjust judge's eventual granting of the widow's request?

A God's reluctance to answer prayers quickly. B The necessity of offering large sums of money to influence divine judgment. C The difference between human justice and divine justice. D God's willingness to answer persistent prayer compared to the judge's unwillingness.