The human cost of World War I was 40 million. Hence, option D holds true regarding World War I.
What is the significance of World War I?
The World War I took place during the initial years of the first half of the 20th century. It is regarded as one of the most dreadful events of the 20th century that took place on a global level.
A lot of people including innocent populations and troops had to lose their lives. The number of the people who died during the World War I was approximately 40 million.
Hence, option D holds true regarding World War I.
Learn more about World War I here:
https://brainly.com/question/925121
#SPJ2
