Beyond simply recounting the destruction of Jerusalem, what deeper theological purpose does the book of Lamentations serve in the Old Testament?

A To incite hatred and vengeance against the Babylonian Empire. B To provide a historical account of the military strategies used during the siege of Jerusalem. C To express profound grief and repentance, acknowledging Israel's sin as the cause of their suffering and pleading for God's mercy. D To encourage the Israelites to assimilate into Babylonian culture and abandon their religious practices.