Economist: On average, the emergency treatment for an elderly person for injuries resulting from a fall costs $11, 000. A new therapeutic program can significantly reduce an elderly person' s chances of falling. Though obviously desirable for many reasons, this treatment program will cost $12, 500 and thus cannot be justified. Which of the following, if true, most seriously undermines the conclusion of the argument? ['Falls resulting in serious injuries are less common among elderly people living in nursing homes than they are among elderly people who live alone at home.', 'The new therapeutic program focuses on therapies other than medication, since overmedication can cause disorientation and hence increase the likelihood that an elderly person will have a serious fall.', 'Among elderly people who had followed the program for only a few months, the number of serious falls reported was higher than it was for people who had followed the program for its recommended minimum length of one year.', "A frequent result of injuries sustained in falls is long-term pain, medication for which is not counted among the average per-person costs of emergency treatment for elderly people's injuries from such falls."]