All of the options listed contributed to the development of social stratification, but certain factors had a more direct impact.
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Fewer people were needed to grow more food: This led to surplus food production, which allowed some people to engage in other occupations, leading to a division of labor and the accumulation of wealth and power among certain groups.
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Intensive agriculture required greater labor reserves: This created hierarchies based on land ownership and labor control, allowing some individuals or families to rise above others socially and economically.
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Marketplaces were developed: The rise of marketplaces facilitated trade and the emergence of merchants as a distinct social class, further contributing to social stratification.
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Religious systems were developed: While religious systems contributed to social stratification by establishing authority figures (like priests) and creating social norms, their impact was often a reflection of existing stratification rather than a direct cause.
In summary, while all these factors played a role, intensive agriculture required greater labor reserves and fewer people were needed to grow more food are particularly significant in leading to the development of social stratification.