The common similarity when the four modernizations were initiated by both administrations of Mikhail Gorbachev and Deng Xiaoping was that both adopted elements of capitalism. As we all know, both these nations are communist in nature, however, both leaders became open-minded in inhibiting the ideas of capitalism from the West.
Well first what the statements to choose from
C.Walls around the city provided protection from enemies
The believe that the answer to the question asked above is that it<span> is decided by how many people are needed to give control of the district.</span>
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Probably to either to team up for a common goal or to oversee the trades in their area.