Stress does increase the risk of disease because it alters with ones brain and nerves which can lead to deadly diseases.
Nazi Germany and the Soviet Union had a non aggression pact. When Germany's attempt to conquer England failed Hitler turned his attention to the Soviet Union. When Germany broke the treaty with the Soviet Union the Soviet Union asked to join the Allies in the fight against the Axis Powers.
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The answer is D: totalitarian dictators rising to power. Each country listed above had a totalitarian head of state; Adolf Hitler, Joseph Stalin and Benito Mussolini
Emphasis made of finding cost effective ways to reduce air polution
