求助逻辑题一道！！

飞鱼luna

Historian: We can learn about the medicalhistory of individuals through chemical analysis of their hair. It is likely,for example, that Isaac Newton’s psychological problems were due to mercurypoisoning; traces of mercury were found in his hair. Analysis is now being doneon a lock of Beethoven’s hair. Although no convincing argument has shown thatBeethoven ever had a venereal disease, some people hypothesize that venerealdisease caused his deafness. Since mercury was commonly ingested in Beethoven’stime to treat venereal disease, if researchers find a trace of mercury in hishair, we can conclude that this hypothesis is correct.

Which one of thefollowing is an assumption on which the historian’s argument depends?

A.      None of the mercury introducedinto the body can be eliminated.
B.       Some people in Beethoven’s timedid not ingest mercury.
C.       Mercury is an effectivetreatment for venereal disease.
D.      Mercury poisoning can causedeafness in people with venereal disease.
E.       Beethoven suffered frompsychological problems of the same severity as Newton
’s.

飞鱼luna

答案是选B，但是不明白

我也是选的D~~

DUKB24

这题相当蛋疼啊...我选D...不知答案如何