Which statement BEST explains why World War I can be called a true "world" war? A) It was the first war fought on two continents. B) Every continent in the world became involved in WWI. C) Fighting took place on more than one front in Europe. D) Colonies of Imperial powers contributed man, supplies and sites of disputes.

B. B) Every continent in the world became involved in WWI.

Explanation:

Given that all the continents in the world fought in the first world war, it is the first true world war. The war was global and almost all the principal nations in the world fought in the war. The war originated in the European continent and from there it spread to all other continents. Therefore option B answers the question

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