What was the main use for airplanes in World War l?

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.

Explanation: In my words i think because if they need to shoot from high ground insted of from the floor so they can get a better shot.

a.) d-day invasion of normandy.

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the answer is c     : )

explanation:

i don't have an explanation because i don't know, but i think the answer is c because i googled it and google is right : ) just kidding google isn't allways right but the answer is still c. i hope this !