What does the author say helped bring unemployment during the Great De

What does the author say helped bring unemployment during the Great Depression?

The booming defense industry. 

The wise heads’ benefit package.

Nationwide training of workers.

Thorough restructuring of industries.

答案及解析：本题考查细节。倒数第三段“A few years later, a large defense buildup finally provided a fiscal stimulus adequate to the economy’s needs”. 综上，A选项正确。