D is the answer of this question
Answer:
Ögedei Khan, Genghis Khan's third son, ruled the Mongol Empire from 1227 CE-1241 CE. Under Ögedei, the Mongol Empire conquered Eastern Europe by invading Russia and Bulgaria; Poland, at the Battle of Legnica; and Hungary, at the Battle of Mohi.
Georgia had to join the United States again after the civil war.
I believe the answer is D. Stopping all transportation
