Brownlea' s post office must be replaced with a larger one. The present one cannot be expanded. Land near the present location in the center of town is more expensive than land on the outskirts of town. Since the cost of acquiring a site is a significant part of the total construction cost, the post office clearly could be built more cheaply on the outskirts of town. Which one of the following, if true, most seriously undermines the argument's stated conclusion? ['If the new post office is built near the center of town, disruptions to city traffic would have to be minimized by taking such steps as doing some construction work in stages at night and on weekends.', 'The new post office will have to be built in accordance with a demanding new citywide building code.', 'If the new post office is built on the outskirts of town, residents will make decreased use of post office boxes, with the result that mail carriers will have to deliver more mail to homes.', 'If the new post office is built on the outskirts of town, it will require a parking lot, but if sited near the present post office it will not.']