I believe that finding the balance of drones would be putting a limit on how many drones a country can use at one time. I'm not sure on the other 2 questions.
D.. its when metal work was getting big and tools were an outcome.
Answer:Location is a matter of where a particular featured is actually positioned. It refers to the absolute position of a feature. A place describes the relative position of features.
Explanation: NOW MARK ME AS BRAINLIST