If those are your options the answer is B.
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Answer:
D
Explanation:
They separated schools and public transportation first
Egypt was referred to as gift of the Nile.
The Dust Bowl, also known as the Dirty Thirties, was a period of severe dust storms that greatly damaged the ecology and agriculture of the US and Canadian prairies during the 1930s; severe drought and a failure to apply dryland farming methods to prevent wind erosion (the Aeolian processes) caused the phenomenon.
