The correct answer is option A) "Manhattan Project".
Explanation:
The Manhattan Project was the name given to a series of research and development projects that looked for the design and construction of the first nuclear weapons. The code name Manhattan Project was given by the government because it was part of the U. S. Army Corps of Engineers, a group organized by the Manhattan Engineer District.
The three leaders at that time had many disagreements: They disagreed over what to do about Germany. They disagreed over Soviet policy in eastern Europe. Truman was unhappy of Russian intentions.
