The correct answer is D.
The weakeness of the German Weimar Republic, that lasted from 1918 to 1933, gave rise to popular support and the arrival of the Nazi party and Hitler to power.
The Weimar Republic faced numerous problems, mainly economic, related to the accomplishment of the requeriments established by the Treaty of Versailles and the payment of the excessive war reparations imposed on Germany after WWI. Such impositions prevented economic recovery and stagnation led to hyperinflation. Moreover, political extremism and paramilitary forces started to arise, that were fed by the tense relationships maintained with the victorious powers of WWI.
This whole situation triggered the social sucess of Hitler and the country preferred to support his ruling rather than any democratic goverments,.