GRE General Test: RC-525215 GRE Reading Comprehension

Over Several months new residents of a housing development complained to their town council about unpleasant barnyard odors from a nearby farm. The council concluded that, because the residents were not used to rural life, they had mistakenly identified as a barnyard odor the smell of the town's new, leaf-composting pile, located on a site adjacent to the farm.
Which of the following, if true, would most seriously weaken the town council s conclusion?