One Reason the German Revolution of 1918 Failed to Take

One reason the German Revolution of 1918 failed to take a radical turn like the Bolshevik Revolution of 1917 was because the Social Democrats who took power:

A) were revisionist Marxists whose Marxism was tamed and toned down.
B) were focused on imposing a communist dictatorship of the proletariat in Germany.
C) were more skeptical of the Right than of the Left.
D) were careless and launched audacious new social experiments.