Hitler and lenin rose in power by
capitalizing on the harsh post-war conditions in their countries
capitalizing on production of consumer goods
encouraging free press and unbiased news coverage
encouraging peace and cooperation to rebuild their countries

I believe it's A: capitalizing on the harsh post-war conditions in their countries.

The correct option is: "capitalizing on the harsh post-war conditions in their countries "

Vladímir Ilich Ulyanov was a politician, philosopher, revolutionary, political theorist and Russian communist. Leader of the Bolshevik sector of the Social Democratic Labor Party of Russia, he became the main leader of the October Revolution of 1917. In 1917 he was appointed president of the Council of People's Commissaries (Sovnarkom), becoming the first and maximum leader of the Union of Soviet Socialist Republics (USSR) in 1922. Adolf Hitler was a politician, military man, painter and German writer, of Austro-Hungarian origin; imperial chancellor since 1933 and Führer-leader-of Germany from 1934 until his death. He brought to power the National Socialist German Workers Party or Nazi Party, and led a totalitarian regime during the period known as the Third Reich or Nazi Germany.