Alright, lets get started.
Miles and yards are the units for measuring distances. When we need to find distance between two objects, we use miles or yards.
So, option C and D are not the answer.
For option B, 9 inches, is too small for any pole as its less than 1 feet too.
So, option B is also not the answer.
Now option A, 9 feet, it seems most relevant for measuring the height of a pole.
So the answer would be A, 9 feet. : Answer
Hope it will help :)