The cause for the development of the river valley civilizations in the world would be the invention of techniques for planting crops and herding animals.
What is a river valley civilization?
A settlement of humans near the banks of a river, typically near hilly or valley regions for the purpose of formation of a society, is known as a river valley civilization.
The initial river valley civilizations began in Asia and Africa in the regions like Indus River, Nile River and Yellow River. Farming and cattle breeding were highly followed activities during such period.
Hence, option A holds true regarding River Valley Civilization.
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