Q: Pick which sentence is not logical.
Options:
- Sentence A: "The Great Wall belongs to modern architecture"
- Sentence B: "The Great Wall belongs to ancient architecture"

Let's solve this gradually.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The Great Wall of China was not built in what are considered to be modern times. The answer is Sentence A.