Refer to the passage.

"4. As a result, it is indicated that the future may see a time when such a weapon may be constructed in secret and used suddenly and effectively with devastating power by a willful nation or group against an unsuspecting nation or group of much greater size and material power. With its aid even a very powerful unsuspecting nation might be conquered within a very few days by a very much smaller one; although probably the only nation which could enter into production within the next few years is Russia.

5. The world in its present state of moral advancement compared with its technical development would be eventually at the mercy of such a weapon. In other words, modern civilization might be completely destroyed.

6. To approach any world peace organization of any pattern now likely to be considered, without an appreciation by the leaders of our country of the power of this new weapon, would seem to be unrealistic. No system of control heretofore considered would be adequate to control this menace.”

Excerpt from a memorandum discussed with the US president regarding the development and use of the atomic bomb, 1945

What was the United States’ political concern regarding the outcome of the Manhattan Project?

There was concern that the atomic bomb would not be able to stop the war.
There was concern that the atomic bomb would be too destructive and difficult to control.
There was concern that Japan would successfully launch an atomic bomb before the United States did.
There was concern that using the atomic bomb against Japan would cause the United States to lose the respect of other nations.