In the Parable of the Persistent Widow (Luke 18:1-8), what theological point is Jesus primarily making about prayer, beyond the need for persistence?

A God is reluctant to answer prayers and needs to be persuaded through repeated requests. B God, unlike the unjust judge, is inherently just and will ultimately avenge His elect who cry out to Him day and night. C Prayer should primarily be focused on seeking justice and retribution against one's enemies. D The parable encourages believers to manipulate God through constant appeals, similar to how the widow wore down the judge.