I think the most reasonable answer would be the second option, B. “Critical value”
Human societies are characterized by patterns of relationships (social relations) between individuals who share a distinctive culture and institutions. (it may range from Hunting and gathering society to Post-industrial society). since it may vary over space and time therefore there is no absolute limit to call a society as a developed society.
They did the kkk and the Jim Crow laws and more
The indirect approach, focusing on logic, because I don’t have a reliable reputation with my audience yet and wouldn’t be considered a reliable source.