Question

the items listed below were direct causes of what major event/impact?
trench warfare
submarines
airplanes
poison gas
machine gun
flamethrowers
?
○ high casualty rates
○ italy joining the allies
○ relocating jewish people
○ women being drafted in the us army

Explanation:

The listed military technologies and tactics (trench warfare, submarines, airplanes, poison gas, machine guns, flamethrowers) were all used extensively during World War I. These innovations and defensive/offensive methods led to unprecedentedly high numbers of military and civilian deaths and injuries, as they drastically increased the lethality of combat and created stalemates (like trench warfare) that prolonged fighting and casualties. The other options are not directly caused by these items: Italy joined the Allies over territorial disputes, relocating Jewish people was a Nazi policy in WWII, and women were not drafted into the US Army in WWI/WWI-era conflicts.

Answer:

High casualty rates