Outdoor sports unlimited, a retail store, must use reasonable care on its premises to warn its customers of

They have to use reasonable care to warn about hidden risk. These are the dangers that might not be totally foreseeable at a location, but still need to be brought to light in case they do take place. The business needs to make sure that the ordinary person, exercising the average level of judgment, would not do something that would lead to injury or damage in some way.