Concept:In management, the term that describes how many subordinates a supervisor directly oversees is called span of control.
Explanation:The question asks for the correct management principle that matches the number of subordinates a head of department supervises.
A head of department manages a specific number of employees directly under them.
This direct supervisory limit is known as the span of control.
Unity of command means each employee receives orders from only one superior.
Chain of command refers to the line of authority from top to bottom levels.
Unity of direction means all activities with the same objective should have one plan and one head.
None of these other terms describe the count of subordinates.
Therefore, the correct option is span of control.
Answer:C. span of control