Answer :
World War I is considered the first modern war because of the (1)tanks, machine guns, international organizations, total warfare, airplanes, u-boats, and poison.
World War I is considered the first modern war primarily due to the extensive use of industrial technology in warfare. Machine guns, tanks, airplanes, and poison gas were used extensively for the first time. These technologies made the war far more mechanized and deadly, altering the nature of battles and leading to massive casualties.
The introduction of total warfare strategies, which involved mobilizing entire nations’ resources towards the war effort, also differentiated it from previous conflicts. The correct option that encompasses these advancements is: tanks, machine guns, international organizations, total warfare, airplanes, u-boats, and poison gas.
