Answer: D. Division of labor
Step-by-step explanation:
In order to achieve efficiency, it is often best to divide a production task into various segments which can then be worked on by different people. This is called division of labor.
The basic premise underlying this is that people are more likely to be more productive if they focus on one thing at a time as opposed to several. Focusing on that one thing means that the person will find ways to accomplish the task as efficiently as possible which would therefore ensure that the entire production task is done efficiently as well.