Answer: A. The dangerous and aggressive expansion of totalitarian nations
Explanation:
The rise of totalitarian nations and dictators such as Hitler, Mussolini, Franco, and Stalin, was a fundamental element in starting WW2. Totalitarian governments gave its leaders enough power to seek belligerent purposes without resistance from their populations.
This allowed them, specially in the case of Japan and Nazi Germany, to pursue aggressive invasions that eventually started the war.
