Answer:
C. Demand
Step-by-step explanation:
Specialized society refers to the type of society that focused most of its resources to produce one specific good. This could only be possible if there are a lot of other societies that demanded that specific type of good.
One example of a successful specialized society is Qatar, which specialized in oil production. (it take up around 85% of their export income). Qatar wouldn't be able to achieve the same success if oil is not a demanded commodity all across the world.