Having an efficient, appealing store layout makes good economic sense. So, the grocery store needs to purchase new shelving systems, since the grocery store should always do what makes the best economic sense. The conclusion drawn above follows logically if which one of the following is assumed? ['There is not some other improvement that makes more economic sense for the grocery store than does investing in a new shelving system.', 'New shelving is required in order for the grocery store to have a floor plan that is efficient and appealing.', 'The grocery store can afford to purchase the new shelving that is being proposed.', 'Cost-effective shelving is an integral part of an efficient grocery store.']