The correct answer is B) by establishing overseas colonies.
European nations competed for power in the years before World War I by establishing overseas colonies.
Between 1881 and 1914, European powers competed for each other to establish more colonies in Africa and other parts of the world. In the case of the African continent, the dispute was so high that the term of "Scramble for Africa" was coined. European countries such as Great Britain, France, and Portugal occupied, colonize or split the African territories to get more power and dominion.
World War 1 started in August 1914.
