All of the following led the great depression except A) buying dead stock
B)the stock market crash
C)overproduction
D)the 1932 presidential election

C!

Explanation:

Overproduction can cause downfalls, due to the fact that there's too much production, and during the Great Depression most people did not have jobs, and struggled with economy.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)