I would say that equality in hunter-gatherer societies has a huge implication for the modern world.
The hunter-gatherer societies were the "original" societies, to which the humans evolved and the finding that the societies were much more egalitarian (both in terms of gender equality and social class equality) means that people cannot claim that inequality is somehow "natural" - it supports the need for equality in the modern world.
My best guess would be, "B", "Grammatical conventions were much different then."
The correct answer is C because we know that layers of government is a characteristic of a form of government and so is A and B so the best answer is C. it never talks about socialization through education in no form of government.