Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.

(B) The virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.

(C) The virus alone has been observed in many cases of the disease.

(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.（C）

(E) Onset of the disease usually follows infection by both the virus and the bacterium.

why not B?

原文：it is actually the VIRUS that causes the disease

問：most support the implication

A: 主角- bacterium

B: 主角- virus + bacterium

C: 主角- virus

D: 主角- virus + bacterium

E: 主角- virus + bacterium

所以選C

(这种选法不晓得NN能否认同...請指教...)

我想问一下，原文中说the bacterium thrives in the presence of a certain virus，implying that it is actually the virus that causes the new disease.表明:virus-->bacterium-->the new disease,并没有说是virus alone导致的diease.

选项B中The virus has been shown to aid the growth of bacterium，和原文中一样都提到了virus和bacteruim的关系。

而答案C中The virus alone has been observed in many cases of the disease.却并没有说明virus和bacteruim的关系，也没有说明virus是导致diease的主要因素。

还请高手指教！

原文的意思是这种病发现在细菌和病毒都出现的时候，所以表明了对于这种病究竟是由什么引起是不确定的。

文中的结论是virus that causes the new disease

要去证明这个结论，只要证明在病毒单独出现时这种病出现就可以了