A small organization producing standard products is most likely to use functional departmentalization. This structure groups employees by common functions such as production, sales, purchasing, accounting, and administration. It is efficient for smaller, stable organizations because it promotes specialization, clear reporting lines, and economies of expertise without unnecessary complexity. Product departmentalization is more likely when an organization has multiple distinct product lines requiring separate management. A matrix structure is more complex and is generally used where employees report across both functional and project or product lines. A divisional structure is normally used by larger organizations with multiple products, regions, or markets. Internal audit should understand organizational structure because it affects accountability, segregation of duties, communication, and control design. Therefore, Option A is correct.