Option (B) Inventory Turnover Ratio is the correct answer. The question refers to 'stockouts', which implies a shortage of inventory. The provided context focuses extensively on the calculation of the Inventory Turnover Ratio (Illustration 13, Questions 13-15), defining it in relation to Average Inventory and Cost of Revenue from Operations. Since this is the only ratio among the options directly linked to inventory management, it is the correct choice. The other options are incorrect based on the context: the Average Payment Period relates to bill-paying patterns (MCQ v), the Average Collection Period relates to credit collection (MCQ iv), and the Quick Ratio relates to liquid assets and liabilities (Chunk 1).