The correct answer is - A) Germany would attack France first, then Russia.
The Schlieffen Plan, named after its creator, Alfred von Schlieffen, was a military plan of offensive and invasive strategy for the Germans. This plan in its essence had the invasion of France first, through the territories of Belgium and Luxembourg, and after France is occupied, Russia was supposed to be the next one attacked.
The plan had its flaws from the start, with the plan of invading France, as the invasion through the suggested routes was almost impossible because the infrastructure of the region did not allowed big mass of soldiers and artillery to pass by quick enough, nor in a sufficient number.
