All of the following were circumstances leading up to the Great Crash of 1929 except C) "many industries could not keep up with the demand for their products."
The Great Depression of the 1920s was one of if not the worst economic crisis the US has ever seen.
One of the causes and one of the results of it as well was exactly the shortage of demand against a high production rate. People weren't buying what was being made, which led to waste, which led to layoffs, which led to lessmoney on the people's hands which led to people buying even less, which made the situation even worse.