What Was the Most Striking Characteristic of the Stock Market

What was the most striking characteristic of the stock market in 1929?

A) investors' obsession with speculation
B) the downward trend of major stocks early in the year
C) the government's desire to carefully regulate the market
D) the fact that the majority of wage-earning Americans were so heavily involved in it
E) its steady advancement through the decade, culminating in record levels in 1929