Why was world war i called the great war? select all that apply.
because it involved many nations
because of the violence and brutality
because it was the first time air warfare was used
because it was the last time a cavalry was used

  Because it involved many nations.

Explanation:

  It was called the Great War because the world has never seen a conflict of that size. Over 59 million troops were mobilized. Many millions of people died or get injured. The conflict reshaped politically, economically, socially, and culturally Europe and the whole world.

  It was named like that because the people of those days did not believe that almost 30 years after that the world would be at the most disastrous conflict of its history.

  I hoped this answer helps you.

d should be removed as it shows bias

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