og-172

n9a5x7

172. There is a great deal of geographical variation in the frequency of many surgical
procedures—up to tenfold variation per hundred thousand between 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

答案是B，看过OG的解释和以前的讨论帖，还是有点不明白，可不可以这样理解，数字的差异与必要的手术无关，所以与不必要的手术有关，从而得出结论。谁能帮我看一下？

n9a5x7

自己顶

n9a5x7

可爱的叮当,能解释的更清楚一些吗?有点看不懂

另外,能翻译一下选项B吗?