In the last ten years, usage of pay phones in Bridgeport has dropped b

Following is the best reason I can come up with for the answer C.
A) Irrelevant to the topic
B) Incorrect comparison
C) Seems logical to some extent but the argument is not discussing if low income people make use of cell phones or not
D) If true would mean that the low income people might go to the middle and high income locality to make use of the payphone
E) Revenue is not a part of the discussion

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In the last ten years, usage of pay phones in Bridgeport has dropped by 90%.Since cell phone usage is much higher among middle- and upper-income residents of Bridgeport than among lower-income residents, the Bridgeport City Council has decided to remove pay phones from middle- and upper-income neighbourhoods, while retaining those in lower-income neighbourhoods, reasoning that this plan will respond appropriately to demand for pay phones and thereby inconvenience very few people.

Type- evaluate

(A) Whether pay phones are used by criminals conducting drug deals - Irrelevant
(B) A comparison of pay phone usage between middle income and high income residents - Irrelevant - middle and high income are in the considered in the same group of high amount of cell phone usage
(C) How many low-income residents use cell phones - irrelevant as the number of not important
(D) Whether low-income residents typically use pay phones close to home - the argument assumes that people use only the pay phones that are in their neighborhood - but if lower income people use the pay phones in other neighbourhoods in which middle and upper income people live then the move will be counterproductive - Correct
(E) Whether eliminating pay phones would lose revenue for the city - irrelevant

Answer D

Which of the following would be most helpful to know in order to evaluate the reasoning of the City Council?
(D) Whether low-income residents typically use pay phones close to home

Our goal is to find "two path answer ": an answer that can be interpreted in two ways one of which will strengthen and other of which will weaken the conclusion.

Yes :Low-income residents typically yes pay phone close to home then it is a good idea to remove pay phone from high income and middle-income home area. strengthen conclusion

No: Low-income residents typically do not use phone close to home . In that case it is not a good idea to remove. weaken the conclusion

boiled down to C and D.
D is a common pattern in gmat, or D can be paraphrased as whether pay phone sticks with the demand in the low-income area.

Premise: In the last ten years, usage of pay phones in Bridgeport has dropped by 90%.
Premise : Since cell phone usage is much higher among middle- and upper-income residents of Bridgeport than among lower-income residents, the Bridgeport City Council has decided to remove pay phones from middle- and upper-income neighbourhoods, while retaining those in lower-income neighbourhoods,
Conclusion : reasoning that this plan will respond appropriately to demand for pay phones and thereby inconvenience very few people.

(A) Whether pay phones are used by criminals conducting drug deals
Out of Scope
(B) A comparison of pay phone usage between middle income and high income residents
Comparison between low income and (middle + high income) is required. So Out of Scope.
(C) How many low-income residents use cell phones
This might confuse you. As it doesn't give answer to full conclusion which is removing pay phones from middle- and upper-income neighbourhoods, while retaining those in lower-income neighbourhoods.
(D) Whether low-income residents typically use pay phones close to home
This gives clear cut evaluation. If low-income residents use pay phones close to home, decision is correct. If they use pay phones in the area of middle & high-income neighbourhoods (may be if they go for work there), then decision is not correct. So, this is the answer
(E) Whether eliminating pay phones would lose revenue for the city
Revenues is Out of Scope.

Ans is D as that is appropriate reason to have pay phones in neighborhood with low income group

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