In the Parable of the Persistent Widow (Luke 18:1-8), what attribute of God does Jesus emphasize through the contrast with the unjust judge?

A God's vengeful nature and desire to punish evildoers. B God's unwavering faithfulness and willingness to answer the prayers of those who cry out to Him consistently, even when it seems He is delaying. C God's capricious nature and unpredictable responses to human pleas. D God's indifference to the suffering of the marginalized and oppressed.