The correct statement about the decision to drop the atomic bombs is:
Truman wanted to save as many lives as possible and end the war quickly.
This reflects the commonly cited rationale that President Truman believed using the atomic bombs would lead to a quicker end to the war with Japan, ultimately saving lives that would have been lost in a prolonged conflict, including a potential invasion of the Japanese mainland. The other statements do not accurately represent the historical context or Truman's motivations in the decision-making process.