Question

which event killed 50 million–100 million people worldwide after world war i?
○ malaria outbreak
○ earthquake - triggered tsunamis
○ flu pandemic
○ the bolshevik revolution

Explanation:

After World War I, the 1918 flu pandemic (Spanish flu) killed 50 - 100 million people worldwide. A malaria outbreak doesn't match this scale post - WWI. Earthquake - triggered tsunamis are local/regional disasters and not on this scale. The Bolshevik Revolution was a political event, not a mass - casualty event of this nature.

Answer:

C. flu pandemic