请教 LSAT-8-IV-23 题,晕啊!!!

下面这一题,我怎么都觉的B是有WEAKEN的啦,怎么会选B呢?

各位NN帮忙指点下啊!!!!

谢了!!!!

Questions 22-23
Doctors in Britain have long suspected that patients who wear tinted eyeglasses are abnormally prone to
depression and hypochondria. Psychological tests given there to hospital patients admitted for physical
complaints like heart pain and digestive distress confirmed such a relationship. Perhaps people whose
relationship to the world is psychologically painful choose such glasses to reduce visual stimulation, which is
perceived as irritating. At any rate, it can be concluded that when such glasses are worn, it is because the
wearer has a tendency to be depressed or hypochondriacal

23. Each of the following, if true, weakens the argument EXCEPT:
(A) Some people wear tinted glasses not because they choose to do so but because a medical condition of
their eyes forces them to do so.
(B) Even a depressed or hypochondriacal person can have valid medical complaints, so a doctor should
perform all the usual objective tests in diagnosing such persons.
(C) The confirmatory tests were not done for places such as western North America where the usual quality
of light differs from that prevailing in Britain.
(D) Fashions with respect to wearing tinted glasses differ in different parts of the world.
(E) At the hospitals where the tests were given, patients who were admitted for conditions less ambiguous
than heart pain or digestive distress did not show the relationship between tinted glasses and depression or
hypochondria.

题目的结论是when such glasses are worn, it is because the wearer has a tendency to be depressed or hypochondriacal，即带这种眼镜的原因是忧郁。

选项里面的a,c,e都围绕着这两者的因果关系，c说论据本身有问题，而b则和谁都无关啊。

不太懂得