The amount of time allotted for a patient's office appointment is largely dependent on the

It could be patient-doctor interaction.  It also may dependent on the doctor’s diagnosis and the amount of consultation given to the patient on what he must do and what medication he must take. The more cooperative both parties are, the faster the consultation will be.

C. division of labor

Explanation:

Division of labor -

It the method to divide the number of people according to their specialization to perform a particular task  , is known as division of task .

The process helps to fasten the process as , the expertise of the particular will perform the task in a better and fast way , rather than others , and the overall task will require lesser time for completion .

Hence , the example shown in the question is about division of labor .