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

A God's indifference to human suffering. B God's eventual, but reluctant, response to prayer. C God's accessibility only to those who are persistent and demanding. D God's just and timely intervention on behalf of those who cry out to Him, especially the vulnerable.