D because yeah it says i need 20 characters
Answer:
C. The threat of nuclear war.
Was there a book there a book or a passage that you read cause we can't give a strait up answer if we don't know the the thing to read...
About 35 years. Genghis Khan created the Mongol empire in 1206. By the 1230s Batu Khan invaded Russian and Bulgarian lands. In 1241 at the battle of Mohi Batu Khan defeater a combined German, Polish and Hungarian army. Further expansion ceased do to the death of Ogedei Khan. Batu Khans attention was turned to succession instead of invading Western Europe.
