53．There is a great deal of geographical variation in the frequency of many surgical procedures-up to tenfold variation per hundred thousand people among different areas in the numbers of hysterectomies，prostatectomies，and tonsillectomies.
To support a conclusion that much of the variation is due to unnecessary surgical procedures，it would be most important to establish which of the following?
(A) A local board of review at each hospital examines the records of every operation to determine whether the surgical procedure was necessary．
(B) The variation is unrelated to factors (other than the surgical procedures themselves)that influence the incidence of diseases for which surgery might be considered．
(C) There are several categories of surgical procedure(other than hysterectomies，prostatectomies，and tonsillectomies)that are often performed unnecessarily．
(D) For certain surgical procedures，it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded·
(E) With respect to how often they are performed unnecessarily, hysterectomies, prostatectomies，and tonsillectomies are representative of surgical procedures in general．
Argument Construction
Situation The frequency of certain surgical procedures, e. g., hysteredctomies, prostatedctomies, and tonsillectomies, varies dramatically by geographical region. It may be possible to conclude that the disparity is to a large extent the result of the performance of unnecessary surgeries.
Reasoning What additional information must be true for this conclusion to hold? Is it possible that different factors in different regions might reasonably account for the variation? Diseases or medical conditions for which these surgical procedures are appropriate might be more common in one geographical area than another．If the possibility of such geographical variations in the incidence of pertinent me(1ical conditions is ruled out，it is fair to conclude that the variation Can be attributed to unnecessary surgical procedures．
A This statement undermines such a conclusion since it cites a process in place for Preventing or reducing unnecessary procedures．
B Correct．This statement properly identifies additional information that eliminates the possibility that the geographical variation is due to legitimate factors.
C The argument is concerned only with hysterectomies，prostatectomies，and tonsillectomies；other surgical procedures are irrelevant．
D The difficulty in determining whether or not surgery is necessary makes any conclusion ambiguous so this statement will not lead to the intended conclusion．
E The argument involves only the three kinds of surgery cited in the passage，so this statement is irrelevant to the conclusion．
The correct answer is B．
我怎么觉得这个的C的解释不对呢？？ 题目中的in the numbers of ***是啥意思呢？ thanks
对此题有同样困惑
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