Step 1: Understanding the Concept:
This question pertains to a significant event during the end of World War II - the use of atomic weapons.
Step 2: Detailed Explanation:
The United States of America is the only country to have used atomic weapons in warfare. During World War II, the U.S. dropped two atomic bombs on Japan in August 1945.
- The first bomb, named "Little Boy," was dropped on the city of Hiroshima on August 6, 1945.
- The second bomb, named "Fat Man," was dropped on the city of Nagasaki on August 9, 1945.
The project to develop these bombs was known as the Manhattan Project. The other countries listed were involved in WWII but did not use atomic weapons.
Step 3: Final Answer:
America (the United States) used the atomic bomb during World War II. Therefore, option (B) is the correct choice.