If the public library shared by the adjacent towns of Redville and Gle

We can make a similar argument for option B
Even if the area of Glenwood is same as the area of Redville and if there are more people in Glenwood what if the walking distance to the library is less in Redville than in Glenwood.In this case it is better not to move to Glenwood.
E tells us that such is not the case.

Hence E could be a strengthener too.

Though I am not an expert I feel this is not too good a question.
here option B and E are too close to choose one over the other.

OE from Kaplan:

The author claims that if the library shared by Redville and Glenwood were relocated from central Redville to central Glenwood, then a larger number of library users would be within walking distance of the library. Well, first of all, let’s realize that, although the two buildings are described by terms such as “overcrowded” and “larger,” the conclusion is not based on these characteristics—it’s only based on the number of people who will be within walking distance of the building. Moving on, the evidence provided is that there are many more people living in central Glenwood than in central Redville, and most people will walk to the library only if it’s near their house. To strengthen the argument, we need to fill in a missing piece. We know that there are more people living in central Glenwood than in central Redville, but we don’t know anything about the area of either city. If Glenwood has more people but they’re spread out over a larger area, then maybe moving the library won’t place it within walking distance for more people. So it would be to the argument’s advantage to show that the two areas are around the same size. (B) says just this, supporting the argument by making its evidence even more relevant.

(A) Where the library was doesn’t help convince us that the library should either move, or stay where it is. The library’s previous location is outside the scope.

(C) We’re only concerned with how accessible the library will be for walkers, so the size of the building is beyond the scope.

(D) Since we’re concerned with people who can walk to the library, (D)’s mention of people who don’t live in either town can neither strengthen nor weaken this argument.

(E) If people currently walk farther than standard walking distance, then perhaps the new library will cater to these people more readily. But we can’t assume that, because we don’t know where they’re walking from. Choice (E) is too vague to have any effect on the argument.

• To strengthen an argument, look to bolster an assumption in that argument. If you can fill in a missing piece, you’ve made the argument stronger.

If the public library shared by the adjacent towns of Redville and Glenwood were relocated from the library’s current, overcrowded building in central Redville to a larger, available building in central Glenwood, the library would then be within walking distance of a larger number of library users. That is because there are many more people living in central Glenwood than in central Redville, and people generally will walk to the library only if it is located close to their homes.

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

OFFICIAL EXPLANATION

(A) No. To strengthen the argument, we need to show that more people will be able to walk to the library if it is relocated to central Glenwood. The fact that the library was once located between Glenwood and Redville does not address this need.

(B) Yes. This question hinges on the population densities of the cities. Suppose Glenwood’s population is twice Redville’s but that the area of Glenwood is 10 times as large as the area of Redville. Then the population density of Glenwood would be one-fifth that of Redville. Hence, fewer people in Glenwood would be within walking distance of the library. The figure below illustrates the situation:



However, if the areas covered by central Glenwood and central Redville are roughly the same, then the population density of Glenwood would be greater than that of Redville. Hence, there would probably be more people within walking distance of the library in Glenwood than in Redville.

(C) No. The argument is predicated on the distance that people must walk to get to the library. The size of the library has no affect on the walking distance.

(D) No. The argument is predicated on the distance that people must walk to get to the library. People living outside both Glenwood and Redville are probably not within walking distance of either site for the library. Perhaps for these people driving distance might be a factor, but not walking distance.

(E) No. If people are walking further than the common walking distance, then for these communities the further distance is “walking distance.”

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