Marta: There have been complaints about the lack of recreational areas in our city. Some people favor turning the old railway land into walking trails, but there may be more productive ways of using that land. Arthur: But the old railway land is ideal for walking trails. Our citizens have gone too long with inadequate recreational areas; we should not dismiss this proposal for walking trails without further consideration. Arthur's criticism suggests that he interpreted Marta to be ['asserting that it may not be possible to convert the old railway land into adequate walking trails', 'assuming that the complaints concerning a shortage of recreational areas are ill founded', 'recommending that the proposal for converting the old railway land into walking trails should be promptly dismissed', 'maintaining that converting the old railway land into walking trails would be an entirely unproductive use of that land']