Considering the parable of the Persistent Widow (Luke 18:1-8), what theological attribute of God does Jesus primarily highlight, and how does this relate to prayer?

A God's unwillingness to be bothered, requiring constant nagging in prayer. B God's capricious nature, making persistence the only way to obtain favor. C God's justice and responsiveness to those who cry out to Him, even when He seems slow to act. D God's limited power, requiring human effort to supplement His abilities.