Question

during world war i, germany used u-boats in combat. what is a u-boat?
a german cargo ship
a ship with a landing pad for airplanes
a type of german submarine
a type of ship with room for passengers and soldiers

Explanation:

U-boats were German military submarines used in World Wars I and II for naval warfare, particularly to attack enemy ships. The term "U-boat" comes from the German "Unterseeboot" (undersea boat).

Answer:

a type of German submarine