What caused the Great Depression of the $1930$s$?"$

Consider the above research question and choose the secondary source that is best suited to answer it$.$

A textbook on economic theory from the early $1920$s

A book published by a historian in $1955$ on the history of the stock market

A newspaper article from $1935$ that blamed Italian immigrants for creating the Depression

A documentary made by a historian from $2009$ on American economics in the $20$th century