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.

This was already posted (from OG10) but I am not sure why (E) can be eliminated (so easily). Can someone please explain? I think (E) is *atleast* relevant because MANY surgical procedures are not JUST the three areas: hysterectomies, prostatectomies, and tonsillectomies. They could be representative of other procedures. Any comments?

Will go for 'C'

OA is B.

Go with B. Since the variation is related to two factors the disease itself or the unnecessary nature of the surgeries. B confirms the fact the variation is not related to incidence of diseases so the variation must be due to the second reason.

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.