mary's successful clothing store was located on the back edge of the parking lot of a large mall. she did not have to pay mall rents since she was not part of the mall, but drew many customers who parked at the mall and then noticed her store. the mall developers built a movie theater on the part of the parking lot directly in front of mary's store, basically hiding her from most mall customers. after about six months, mary's business dropped off so much she had to move. what retailer site selection criterion forced mary to move? room for expansion visibility proximity of competitors adequate parking