When Did Adolf Hitler Have His First True Sense of His

When did Adolf Hitler have his first true sense of his life's purpose?

A) Leading the revolutionaries in Vienna as a teenager.
B) When he began his art career in Vienna and became self-supporting.
C) When he saw the German economy recover under his leadership.
D) During his time as a soldier in the German army during World War I.
E) When he was elected as Chancellor of Germany.