Answer:
2) To disarm the nation
Explanation:
Once the Japanese surrender after the atomic bombs where thrown at them, the Allies rushed to occupy the country. The main reason behind this occupation was to disarm the Japanese. With a disarmed Japan, the threat of this island nation was eliminated both during the rest of the World War II, and for the foreseeable future. Once that problem was solved, the Allies were able to totally focus on Italy and Germany in Europe, so that they do not have any obstacles and try to win the war and end it.