Option C is the right answer for WWII because it resulted in the greatest number of deaths of any war in history.
More people were killed, more countries were involved, and more money was spent in World War II than in any other war in history.
The bloodiest military conflict in history was World War II. An estimated 70–85 million people died, or roughly 3% of the world's population in 1940 (estimated).
During the conflict, 70 million people served in the military, with 17 million soldiers dying.
For more information about WWII, refer below
https://brainly.com/question/1261207