Answer:
a. Production sector
Step-by-step explanation:
In the 1920's, there were great propsperity witnessed all over the United States of America. Things was so good that people never imagined that there would be a great depression that would follow later.
The only sector that suffered when the economic boom was happening was the production sector. This is because, there was an overproduction of goods whereas the consumers where very minimal. This lead to influx of goods into the economy with no one to buy them.