Why did President Truman hesitate to use the atomic bomb?

Truman understood that using an atomic bomb would unleash unprecedented destruction and usher in a world where such weapons could threaten humanity. That concern matches choice C: he worried that the bomb would change the world forever by making it more dangerous. The United States had already tested the bomb successfully, so uncertainty about whether it would work is not the best answer.

AI-written and checked against the verified answer.