A. Warfare was far deadlier than in the past and resulted in enormous casualties
Explanation:
No one would have dared to predict the casualties of World War I. When World War I was declared there were street celebrations in most of Europe’s capital cities. No one even envisaged trench warfare in August 1914 let alone the appalling casualties that occurred over 4 years of fighting. No one could have predicted the horrifying consequences of modern weaponry being used together with out-of-date tactics. The grim figures ‘speak’ for themselves. The estimated number of people killed during World War I varies from 8.5 to 12.0 million.
The brand new technologies caused so many more deaths and the trenches did little to help in the war, ensuing in a stalemate that lasted 4 years on the western front.
I don’t know if this is right but as someone who is native I’m going to guess during conversion of religion. Again I don’t know if that’s the main one they want but it was a contributing factor. :)
