The centers of power shifted from Eastern Europe to the Soviet Union and China.
Answer: Option B
Explanation:
The first world war started in the year 1914 and continued for a long period of at least five years and ended in 1919 and was among two groups where one group had the United states of America, great Britain, France and on the other side were Germany, Austria, Hungary.
Before this war started, the power was in the hands of the Eastern Europe and then it shifted from their hands to the soviet union which was a group of fifteen countries and to China.