How are surplus and division of labor important to early man?

AWhen we have a division of labor, we can have a surplus
BWhen we have a surplus, others can do different jobs
CDivision of labor allowed irrigation to develop

Verified Answer :

The surplus and division of labor were important to early man in the following way:
B - When we have a surplus, others can do different jobs. 
Division of labor is essential to economic development. This allows people to specialize in specific tasks; resulting in greater efficiency and reducing the total cost of producing goods. The division of labor has been around since the earliest records known to man. It was used in its simplest form whether men, women and children performed different tasks around the homestead. The division of labor became an essential part of society during the agricultural revolution.