In the final phase of the Second World War, the United States dropped two atomic bombs over the cities of Hiroshima and Nagasaki on August 6 and 9, 1945. In addition to the large human casualties and long-term harmful effects of radiation, the result of this bombing was the speeding up of Japan's surrender in World War II. The surrender of Japan was practically announced on August 15, and officially signed on September 2.
The answer is: A) Japan surrendered within few days.