2. Which of the following directly caused France Germany and Russia to get involved in world War 1

unrestricted submarine warfare, food shortages, the alliance system, and economic problems are the choices

if possible i have other test questions too

The correct answer here is the option C.

In order to keep the fragile balance of power in the period before the World War I, countries entered alliances with one another. So for example, France, Russia and the Great Britain were in one alliance and the Germans and Austrians in another. If one country entered a war the other were obliged to go to their aid. That is how the World War I escalated.

The answer is:

C. The alliance system