Answer:
its B River valleys provided an ideal environment for agriculture.
Rivers and Valleys made the availability of natural resources necessary for survival. Civilizations flourished around river valleys, as they provided an ideal environment for agriculture.
There were many important civilizations like Mississippi River civilization and Indus Valley Civilizations, which proved to be important for the development of survival of humans.
Rivers flowing through the valleys proved to be a crucial to practice agriculture and the techniques of agriculture were developed during these civilizations.
Presence and availability of natural resources made it convenient for people to reside in such areas and achieve their basic necessities of survival.
Hence, during ancient times the civilizations flourished around the river valleys as they provided an ideal environment to practice agriculture.
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