Answer choice B

@shafieiava, Let's take a look at (B) and (E). (B) says, "West Nile virus is most common in those parts of North America with the highest density of mosquitoes." The problem with (B) is that the argument doesn't ever discuss mosquito density. Thus, (B) has no support, as it could be the case that the West Nile virus is most common in areas where infected birds and mammals are the most common. Thus, (B) is out. (E) says, "West Nile virus was not carried to North America via an infected person." Because an infected human being can't infect another mammal, bird, or mosquito with the West Nile virus, it's impossible that a human is responsible for bringing the West Nile Virus to North America. Thus, (E) is most strongly supported by the stimulus, so it's the correct answer choice. Does this answer your question? Let us know if you have any other questions!