The sentence that best states a major theme of "Civil Peace" is:
d) "After the war, life goes on, and hope endures."
"Civil Peace" by Chinua Achebe is a story that emphasizes resilience and hope in the face of adversity, particularly in the aftermath of a devastating civil war. The story conveys the idea that even in the most challenging circumstances, people can find a way to rebuild their lives and maintain hope for the future.