The correct answer is Code name for secret research and development program to build an atomic bomb during WWII.
The Manhattan Project was one of the most important scientific programs in American history. This lead to the creation of the first atomic bomb that could be used by the US military. Ultimately, the United States would use multiple atomic bombs at the end of World War II against the Japanese cities of Hiroshima and Nagasaki. The use of these atomic bombs changed the face of warfare forever.
The correct answer among all the other choices is 4. through overthrowing the swiss monarch and establishing a council of nobles. This is how the Switzerland become the direct inheritor and propagator of roman republicanism. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.