The correct statement is that a social class system with the farmers being at the bottom is one of the similarities of the Huang river and Indus Valley Civilizations. So, the correct option is B.
The civilization era was developing where the main occupation of the people was farming. Whereas, the wealthy men and rulers having substantial powers exploited them.
The Indus Valley civilization took place in the present day boundary parts of India and Pakistan and some parts of Afghanistan and Nepal.
Huang river civilization took place in countries like China and Tibet. And shared boundaries with princely North Eastern parts of India and Nepal.
Both the civilizations were strongly connected to the boundaries of India and there is traditional Indian culture which can be experienced in these civilizations.
As farming was the primary occupation in India, a social class system of middle class people were formed where farmers were being kept at the bottom and landlords and rulers at the top.
Hence, the correct option is B that the similarity between the Huang river and the Indus Valley civilizations is that of formation of a social class system with farmers at the bottom.
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