In the Parable of the Persistent Widow (Luke 18:1-8), what does the unjust judge's eventual granting of the widow's request primarily emphasize about God's response to prayer?

A God is similar to the unjust judge, eventually giving in to persistent nagging. B God is unlike the unjust judge and will certainly answer the prayers of those who cry out to Him in faith. C God only answers prayers that are repeated continuously without ceasing. D God only answers prayers that are related to justice and legal matters.