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 items (trench warfare, submarines, airplanes, poison gas, machine guns, flamethrowers) are all weapons or warfare methods used in World War I. These technologies and tactics led to large - scale destruction and loss of life, which resulted in high casualty rates. Italy joining the Allies was a political/military alliance decision not directly caused by these weapons. Relocating Jewish people was a WWII - related action. Women being drafted in the US Army was not a direct result of these WWI - era weapons and warfare methods.

Answer:

A. High casualty rates