When they don’t know the basic economic definitions. Just
like any subject, they need to know as well as understand the terms involved in
economics. Just like any other subjects,
economics has a variety of terms that they use and it is necessary to know them
and understand them for they play a big part in our society.
The main cause was the Stock Market Crash of 1929.
I'd say B. but i'm not sure. It could be D. aswell