问一道JJ中的逻辑～快考了，请赐教！

Lime disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lime disease would likely decline.  

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

A. Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lime disease in humans.

B. There are no known cases of a human’s contracting Lime disease through contact with white-footed mice. 
C. A deer tick feeds only once while in the larval stage.
D. A single host animal can be the source of bacterium for many tick larvae.
E. None of the other species on which deer tick larvae feed harbor other bacteria that ticks transmit to humans

 参考答案：C

不是很理解这题，请NN们帮忙解答一下。

还有，能帮偶稍稍翻译一下么？

谢谢～

tick导致lime,tick从mice上面感染;当其他的食物增多了，tick从mice那里摄食就减少了么？也就是说tick从食物中摄食的几率是相等的。C说tick只捕食一次，也就是说这一次发生在所有的食物种群中。要是它捕食很多次，则有可能迟早会去吃mice

哦，原来是这样的啊……

谢谢～

可是怎么感觉这题的答案不怎么像加强，而更像假设题呢？