In the book of Revelation, what overarching theological purpose do the letters to the seven churches serve, beyond addressing local concerns?

A To provide historical documentation of the early church's struggles, offering insights into their organizational structures. B To demonstrate God's detailed knowledge of and concern for individual congregations, foreshadowing His judgment on all nations. C To establish a prophetic template for the entire church age, illustrating recurring patterns of faithfulness and apostasy throughout history. D To showcase the diversity of early Christian beliefs and practices, highlighting the challenges of maintaining unity within the church.