Based on the available options, the early hunter-gatherer human societies are commonly categorized by "small nomadic clans of humans."
This is because the hunter-gatherer human societies usually move from one place to another in search of food without a permanent place.
Such movement for food and shelter is often described as nomadic.
Also, due to their constant movement, such societies are usually moving in smaller numbers of humans or groups.
Hence, in this case, it is concluded that the correct answer is option A. " small nomadic clans of humans."
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