On which dates did the US drop atom bombs on Hiroshima and Nagasaki respectively?

• A. Aug 6, 1945 & Aug 9, 1945
• B. Aug 6, 1945 & Sept 12,1945
• C. Aug 5, 1946 & Aug 8, 1946
• D. Aug 9, 1946 & Aug 12, 1946