b) Los Alamos, New Mexico

The atomic bomb was primarily developed in Los Alamos, New Mexico, as part of the top-secret Manhattan Project during WWII. This remote location was chosen for its isolation, which was crucial for maintaining secrecy and security. The project gathered some of the brightest scientific minds of the time, including J. Robert Oppenheimer, and led to the development of nuclear weapons. The work done at Los Alamos culminated in the dropping of atomic bombs on Hiroshima and Nagasaki in Japan, effectively ending World War II.