U believe the answer A I’m not sure though
Hope this helped a little
Answer:
The stock market crashed
Explanation:
A stock market crash is a sudden dramatic decline of stock prices across a significant cross-section of a stock market, resulting in a significant loss of paper wealth, which made many poor.
The device that helped warn the british of incoming planes is the radar
I’d say it would be B. Revolution, since the population is dethroning the ruling class and haven’t yet set up their own.