GWDTN-10中的一题逻辑难以理解

GWD-24-Q 22:

Often patients with ankle fractures that are stable, and thus do not
        require surgery, are given follow-up x-rays because their orthopedists
        are concerned about possibly having misjudged the stability of the fracture. When a number of follow-up x-rays were reviewed, however, all
        the fractures that had initially been judged stable were found to have
        healed correctly. Therefore, it is a waste of money to order follow-up x-rays of ankle fracture initially judged stable.

Which of the following, if true, most strengthens the argument?

     A.      Doctors who are general practitioners rather than orthopedists are
        less likely than orthopedists to judge the stability of an ankle fracture correctly.

B.       Many ankle injuries for which an initial x-ray is ordered are revealed
        by the x-ray not to involve any fracture of the ankle.

C.      X-rays of patients of many different orthopedists working in several
        hospitals were reviewed.

D.      The healing of ankle fractures that have been surgically repaired is
        always checked by means of a follow-up x-ray.

E.       Orthopedists routinely order follow-up x-rays for fractures of bone
        other than ankle bones.

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答案C，原题逻辑是因为很多人做了X-ray发现没有问题，所以follow-up x-rays 是浪费钱。C的意思就是很多医院都在review x-rays,难道这就能对原题形成强化吗？难以理解，请高人点拨

我的理解是，既然已经在hospital x-ray过了，那就不必要再在orthopedists 那儿再看了