The correct answer is option 4: Hiroshima and Nagasaki. During World War II, atomic bombs were dropped on these two cities in Japan. Hiroshima was the first city to be targeted on August 6, 1945, when the US dropped an atomic bomb known as "Little Boy." The bomb instantly killed around 70,000 people and caused long-term effects on the survivors. Three days later, on August 9, 1945, a second atomic bomb named "Fat Man" was dropped on Nagasaki. This bombing resulted in the deaths of approximately 40,000 people. These two bombings played a significant role in Japan`s surrender and the end of World War II. It is worth noting that while Tokyo and Sendai were also major cities in Japan, they were not targeted with atomic bombs during the war.