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C. Vietnam took time and attention away from the war on poverty

Explanation:

The Vietnam war affected Johnson's war on poverty by "time and attention away from the war on poverty"

The Vietnam war which occurred between 1955 to 1975 covered the administration period of President Lyndon B. Johnson, who was the United States President between 1963 to 1969. However, in his efforts to fight poverty in the United States, which will improve education, medical care, urban problems, rural poverty, and transportation, etc. The cost and time spent on the Vietnam war "took away his attention from the war on poverty."

these civilizations were located around fertile rivers, where they could produce an abundance of crops

your answer is c i hope that