A) 23000.18km
B) 21196.18km
C) 20000.18km
D) 22000.18km
🧠 Explanation:
The Great Wall of China stretches roughly 21,196.18 km, making it one of the longest man-made structures globally. Built to protect China from invasions, it crosses mountains, plains, and deserts. “Length” is a noun, and “approximate” shows estimation. Alternatives include expressing it in miles (~13,170 miles). Hence, the correct answer is 21,196.18 km.
