A. Region D
Explanation:
The European countries were well known for conquering countries and establishing colonies all over the world, but they made an exception in one, that being China. Instead of make China a colony, the European countries, usually in bad relations, worked together to take over parts of it, as it was in their best interest.
It may seem unthinkable nowadays for someone to divide China in spheres of interest, but back in the 19th and early 0th century, the country was in terrible condition, so it was easy target for the Europeans. The European interest was mainly economic, so instead of going after all of the Chinese territory, the Europeans captured only the Chinese coastline. This was tactically excellent move, as China was still producing a lot, but it had to export the goods through the sea, and with the Europeans controlling the coastline, the Chinese had to sell everything to them for minimum compensation, while the Europeans were making huge profits.
