ellievanschoiack ellievanschoiack 20-09-2022 History contestada During World War II why was the U.S. so focused on developing an atomic bomb? O a. They knew it was the only way to win the war. O b. They knew that Hitler and the Nazis were developing one to use on the Allies. O c. They knew that Japan was developing one to use in the U.S. O d. They knew that the Soviet Union already had one.