World War I involved countries from:

O

A. North America and Europe only.

O

B. Europe and Africa only.

O

C. every continent except Asia.

O

D. every continent except Antarctica.

A is the correct answer

the correct answer is D, every continent except Antarctica! A is incorrect, as WWI was a global war involving countries from all continents except Antarctica (because there are no countries/governments/troops in Antarctica).

a, p, e, x