1. Sound was the new film technology that was possible I. The late 1920's
3. He created the iconic character Mickey Mouse (present in children's cartoons as well as in the Disneyland theme park) as well as he was the first to use sound in a cartoon.
The Answer you are looking for is B).
If you look back at WWII the way the U.S. ended the war was with a plane dropping the 2 atomic bombs on Japan. So I think that the "use of air-power" did more than a little to help change the way the war was fought.
Assuming this was the time period where the great depression had begun, it’s probably d. opulence