Which statement best explains why tension grew between european leaders over colonialism in africa?

a. some believed the colonization of africa was immoral and illegal.
b. some feared that maintaining colonies in africa would be too expensive.
c. some felt that others were too far away from africa to have colonies there.
d. some were angered because other nations took over their colonies.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

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