CR. PREP 2014：Lyme disease is caused by a bacterium transmit

[cherryJ344]

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 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 Lyme disease-would likely decline.

which of the following would it be most important ti ascertain in evluating the argument.
b) whether the size of the deer ticks population is currently controlled by the availability of animals for the tick's larval stage to feed on.
d) whether the deer ticks that were not infected as larvae ca become infected as adults by feeding on deer on which infected deer ticks have fed.

the answer is B. But I choose D.And I don't know what's wrong with D?

[RonPurewal]

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