Final answer:
Option D would suggest that the military alliance was only correlated to, but not the cause of, France entering the war with Germany.
Step-by-step explanation:
The military alliance between France and Russia before World War I was a significant factor in France entering the war with Germany.
However, if it can be true that the military alliance was only correlated to, but not the cause of, France entering the war with Germany, then option D would suggest this.
If France did not declare war on Germany until Germany attacked France, it indicates that France's decision to enter the war was not solely based on its alliance with Russia, but rather as a response to direct aggression.