Concept:A diagram that shows the positions and structure of a company is an organizational chart.
Explanation:An organizational chart visually represents the hierarchy of positions within a company.
It shows reporting relationships and the chain of command from top to bottom.
This matches the description given in the question.
In contrast, span of control refers to the number of subordinates under a manager.
Vertical integration involves combining firms at different production stages.
A flowchart shows the sequence of steps in a process, not company positions.
Answer:B. organizational chart