Answer: C.)Parts of the population were freed up to do different kinds of work.
Step-by-step explanation:
Before humans engaged in Agriculture, they most hunted and gathered. This gave rise to a nomadic lifestyle that saw them moving from place to place to keep finding food.
This meant that they never had time to develop into complex societies as everyone had to look for food so that there would be enough.
All this changed with Agriculture as humans were able to settle down and still have enough food. Agriculture gave the people surplus food which meant that not everyone had to be involved in the search for food.
This led to people then picking other careers such as becoming traders for the excess agricultural produce or becoming artisans that were paid for their services.
This led to a burgeoning of complexity in societies.