An increase in the inventory turnover rate for a supply chain typically would indicate that...

An increase in the inventory turnover rate indicates that a company is selling its inventory more quickly. This typically means that the total amount of inventory held at various points in the supply chain has decreased. The higher turnover rate reflects more efficient inventory management, leading to:

Reduced Inventory Levels: Less inventory is being held in warehouses, leading to lower storage costs and reduced risk of obsolescence.

Improved Cash Flow: Faster inventory turnover means that cash is not tied up in inventory, improving liquidity.

Better Demand Forecasting: Enhanced forecasting and supply chain coordination reduce the need for high safety stock levels.

While the options A, B, and C may be indirectly affected, the primary indication of an increased inventory turnover rate is the reduction in total supply chain inventory.

References

"Principles of Inventory Management: When You Are Down to Four, Order More" by John A. Muckstadt.

APICS Dictionary, 16th edition.