I would say B. Rivers provided a source of both water and transportation.
This would have to be true, as the great amount of waterways connecting the region would allow for transportation and a supply of water.
When citizens circulate petitions and gather a required minimum number of signatures to put a policy question on a ballot it is called an initiative. Twenty-one states allow their legislatures to put referenda before the voters and give their citizens the right to place initiatives on the ballot. Five other states provide for one mechanism or the other. Eighteen states also allow the recall of state officials a means of forcing a special election for an up or down on a sitting governor or state judge. Like initiative a specified percentage of registered voters must sign a petition asking that a vote be held.
