Considering the Parable of the Persistent Friend (Luke 11:5-8), what key characteristic of God's response to prayer is highlighted, even though God is not a reluctant neighbor?

A God only answers prayers that are spoken loudly and repeatedly. B God is obligated to answer every prayer immediately and exactly as requested. C Persistence in prayer can demonstrate the depth of one's desire and faith, leading to a more profound encounter with God's grace. D God is more likely to answer prayers offered at midnight.