GMAT Critical Reasoning (CR) | 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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