In the Parable of the Persistent Widow (Luke 18:1-8), what aspect of God's character is Jesus highlighting through the contrast with the unjust judge?

A God's capriciousness and unpredictability in answering prayers. B God's reluctance to be bothered by the needs of humanity. C God's inherent justice and willingness to answer the cries of those who persevere in prayer. D God's preference for those who are socially disadvantaged.