Which of the following ranges of percentages is generally accepted to be a best practice...

The correct answer is C. 25 to 30% . Inventory carrying cost is the annual cost of holding stock, usually expressed as a percentage of inventory value. It includes capital tied up in inventory, storage space, insurance, taxes, handling, deterioration, obsolescence, shrinkage, and administrative costs. Option A is too high as a general best-practice range for ordinary inventory carrying cost, though very poor inventory environments may experience high hidden costs. Option B can occur in some controlled environments, but it is low for a generally accepted maintenance/spare-parts carrying-cost estimate. A range around 20% to 30% is commonly used, and 25% is often treated as a practical working assumption. In CRL Work Execution Management, this matters because spare-parts inventory must balance service level against carrying cost. Too little stock causes downtime and emergency procurement; too much stock consumes capital and creates waste. Inventory carrying-cost guidance commonly places carrying costs between 20% and 30% of inventory value.