In the Parable of the Persistent Widow (Luke 18:1-8), what aspect of God's character is Jesus primarily emphasizing through the contrast with the unjust judge?

A God's reluctance to intervene in human affairs unless repeatedly implored. B God's inherent capriciousness and unpredictability in dispensing justice. C God's willingness to be swayed by persistent and manipulative prayer. D God's inherent justice and responsiveness to the cries of those who are vulnerable and oppressed.