What was the main use for airplanes in world war i? airplanes enabled soldiers to observe troop movements and locations. airplanes allowed for the quick movement of resources. airplanes eliminated the need for soldiers in the trenches. airplanes decreased the significance of naval warfare?

The correct answer is A: airplanes enabled soldiers to observe troop movements and locations.

The main use for airplanes in World War I was the artillery spotting and reconnaissance: exploring and gaining information about all activities in the area, before actually attacking.

The aircraft has had an enormous impact and meant a huge help for the soldiers being an important and strategical tool that cooperated with ground forces.