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The argument is "if the population of other species is increased then it would decrease the no. of ticks acquiring bacterium".. so it would be beneficial to enquire whether something like this is currently happening?..or in software terms ...we need a "Proof of Concept" for evaluating above argument this is what the answer says.....hope it helps..
To evaluate the argument it would helpful to know whether Deer Dicks need more number of animals to feed on. If Deer Dick larvae have enough animals to feed on then increasing the population of other animals have no effect.
Hence it would be useful to evaluate the number of animals available for deer dicks larvae to feed on and that is what choice B states
Lyme disease----caused by deer ticks---deer ticks acquire it by feeding on bacterium which is in the larval stage----this bacterium uses mice as the host spreading infection
Now to decrease the offset of this disease, the argument states that we will introduce only those species that cannot serve as host carriers for the bacterium. This would lead to the bacterium feeding on inert hosts and therefore lead to a decrease in the number of lyme disease victims
B clearly states the correct evaluation of the argument by pointing out that this would be an effective way only if the host carrier plays a key role in its spread (i.e. the disease can only spread through the host-carrier concept)