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Answer (D) is correct . Inventory turnover equals cost of sales divided by average inventory. It is an activity ratio measuring the subsidiary’s use of assets to generate revenue and income. A high turnover relative to the industry standard is desirable because it signifies that the firm does not hold excess and therefore unproductive inventory. Efficient management should minimize the sum of investment in inventory, carrying costs, ordering costs, and stockout costs. Operational auditing addresses these efficiency and economy issues as well as accomplishment of objectives and goals and compliance with policies, plans, procedures, laws, and regulations.

Answer (A) is incorrect because This is a function of a financial audit.
Answer (B) is incorrect because This is a function of a financial audit.
Answer (C) is incorrect because Testing inventory turnover addresses economy and efficiency issues, not compliance.