PREP CR1-2, 请教！

2.
            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?

 (A) 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.

(B) 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.

(C) 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.

(D) 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.

(E) A significant
portion of the cost of the new therapeutic program is represented by regular
visits by health care professionals, the costs of which tend to increase more
rapidly than do those of other elements of the program.

LZ要问什么？

我选c

(C) 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.

因为手术之外还有很多其他费用发生，造成手术整体费用大于$11,000,so weaken