Answer
A. Development of agriculture
The direct cause of job specialization in early human civilizations was Development of agriculture.
Explanation
-Job specialization was a process where focus was on ones occupational concentration on where people had most experience in.
-If it increases in high levels among the employees it may make them to be less flexible since it may reduce their ability to perform other types of work within the duties.
-It was sometimes called division of labor because because organisations divided individual tasks into separate groups. This allowed for people to specialize in one area of focus and trade their goods..
Answer: A. Development of agriculture
Explanation: For early human civilization, agriculture was the dominant form of production of goods. Under such conditions, tools and funds for agriculture were developed that made production easier and contributed to the division of labor, where there was a specialization of the job. This kind of production relationship is characteristic of early human civilization that is a traditional economy. In such relations, there was a precisely determined place for everyone in the chain of agricultural production.