A historian researching the motives of the perpetrators of the Holocaust would find which of the following sources most useful?
A. Letters and publications whitten by Nazi leaders before the Second World War.
B. The diary of Anne Frank, written by a Jewish girl who lived in hiding from the Nazis
during the Second World War.
C. Reports of Adolf Hitler's Beer Hall Putsch, his 1923 attempt to take over the German
government.
D. Field reports from American, British, and Russian generals published after the Second
World War.