Within the parable of the Persistent Widow (Luke 18:1-8), what theological concept does the unjust judge represent?

A The inherent wickedness of all earthly rulers, contrasting them with God's perfect justice. B The potential for even the most corrupt individuals to be moved by persistence and empathy. C The nature of God, who, unlike the judge, is always willing to hear and answer the prayers of his people promptly. D An obstacle to prayer, representing the difficulties and delays believers may encounter when seeking God's intervention.