Answer:
B. Hiroshima
Explanation:
Hiroshima is the Japanese city where around 120,000 people were killed by an atomic bomb.
The United States detonated this bomb during WWII, which led to the end of the war.
Appeasement and the Holocaust were also during WWII, however, they do not fit the description in the questions. Appeasement was a political/war tactic, and the Holocaust was a long term event.
So, the correct answer is B. Hiroshima
