An Important Factor in Bringing About the Depression in 1929

An important factor in bringing about the Depression in 1929 was the

A) fact that only 2 percent of the American population owned any kind of stock in 1929.
B) excessive prices charged by American farmers during the 1920s.
C) shallow and superficial nature of prosperity during the 1920s.
D) extremely high cost of wages and raw materials during the 1920s.