I believe it is the third option, hope this helped
<span>Around one third of the total deaths in WWI were not due to actual fighting in the war, in fact they were caused by malnutrition, disease, and being captured as prisoners of war. This could conclude that the U.S did not prepare itself enough for the effects of war on unknown territory and wasn't able to get the most effective training for the many possibilities that come with.</span>
The world in one year may not even exist. Pollution levels and violence are increasing continuously so if we humans do not fix this overtime, our world would lose the resources that we need in order to survive.
Answer:
its b
Explanation:
Because they supplied water for irrigation