In the Gospel of Luke, what is the theological significance of Jesus's parable of the Persistent Widow (Luke 18:1-8) beyond simply encouraging prayer?

A It primarily emphasizes the importance of material generosity towards the poor. B It highlights God's justice and advocacy for the marginalized, contrasting it with the indifference of earthly authorities. C It primarily teaches about the necessity of attending synagogue regularly. D It suggests that persistent prayer guarantees specific outcomes in accordance with our desires.