Answer:
B. They forced Germany to fight along both the Eastern and Western fronts.
Explanation:
In World War One Russia's purpose was to protect Serbia. Another explanation entering the war was that, along with France and Britain, it was a part of the triple alliance and had to assist them in the war. And therefore the while France and Britain were fighting from the eastern front, Russia fought from the western front, forcing Germany to fight both along the Eastern and Western fronts.
The Berlin Conference of 1884<span>–85, also known as the Congo Conference (German: Kongokonferenz) or West Africa Conference (Westafrika-Konferenz), regulated European colonization and trade in Africa during the New Imperialism period, and coincided with Germany's sudden emergence as an imperial power. SOURCE: GOOGLE. </span>
(D) a result of poor conditions and treatment like this lead to the formation b of Unions