求助一道逻辑 deer ticks

lidong123

Lyme disease is caused by a bacterium transmitted to humans by deer ticks.  Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice.  However, certain other species on which the larvae feed do not harbor the bacterium.  If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.
Which of the following would it be most important to ascertain in evaluating the argument?
A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice
B. Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on
C. Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice
D. Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed
E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans

求解释 求真相！

cy004

是D吗？。。。

lidong123

不是！~

cy004

那是啥。。。

lidong123

第二个答案！

cy004

那就是说如果是当今deer ticks的数量因为吃的不够，被限制住了。other species多了以后，它就没限制了，总数量增多，吃infected white-footed mice的数量没变，所以吃的细菌也没少。但是我没明白D为什么错，它长大以后再吃细菌，被吃的细菌不也没少嘛。。。
你能明白我的意思吗？。。。
等NN