The reason the answer is A is because when the supply is greater than the demand the price decreases so the supply can match the demand.
For an example: If the demand at Famous Foot Locker for Nike's is 100 shoes and they have a supply of 200, the price need to be decreased so the supply can equalize with the demand.
This the concept of geometry, we are required to get the coordinates of the point p which is the center of the circle. The center of the circle will be at the point: (x,y) =[(6-1)/2,(6-3)/2] =(5/2,3/2)
