Dissemination :- the act of spreading something, especially information, widely; circulation.
The argument claims that wide dissemination of wireless access is now a practical way to meet urban needs, based on the evidence of its successful use in rural areas. The author then must assume that urban areas provide no additional problems for wireless use.
A supporter would cite something that bolsters the argument.
Conclusion - Wide dissemination of wireless networks in cities is a practical way to meet the needs of city households, schools and businesses
Premise - Rural communities have found that wireless networks are both more reliable and cheaper than land-based networks.
One can 'directionally' prephrase the answer, we have to prove that wireless dissemination in cities is a good idea and the evidence given to support it is that it works well in rural areas, if somehow we can link the rural wireless effectiveness to the urban setting we are good to go!
Moving to the answer choices.
A - Good! Makes the connection between rural and urban conditions. Mark as a contender
B - Oops! If wireless works better in low density areas (aka rural areas) it is a problem, because cities might not be low density areas. Hence reject.
C - Great that Iceland uses wireless and it is rural but it still misses the rural to urban connect. Hence reject.
D - Nah! If this is true wireless in cities not a good idea.
E - The argument is not about rich or poor neighborhoods, it is about wireless in cities. This choice is way off the mark.
Hence A.