Answer: D. it planned to rapidly conquer France, then send its troops East toward Russia
Step-by-step explanation:
When the first World War broke out in 1914, the Germans were faced with war on two front, France and Russia. To counter this, they sent most of their army into France with the expectation that they would rapidly conquer it.
With their troops now free, they would attack the Russians who they figured would take too long to mobilize their forces so would not attack Germany while Germany attacked France.