Answer:
C.It gave them rich soil to grow food
Explanation:
The river is water and with water you can have rich soil due to the good water back then and you can grow really good food when you have good soil.
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After increasing for many decades, there has been a trend of decreasing voter turnout in most established democracies since the 1980s. In general, low turnout is attributed to disillusionment, indifference, or a sense of futility (the perception that one's vote won't make any difference).
impeachment is the answer