Better demand planning can indeed reduce variability and enable a leaner supply chain, which may reduce the need for safety stock. In fact, both Option B (planning) and Option D (information) can lead to improved demand forecasting and reduced uncertainty, which can de-emphasize the need for safety stock. However, information can also enable real-time tracking of inventory and demand, which can further reduce the need for safety stock in the supply chain. Therefore, Option D (information) may be a more comprehensive answer to the question.

A: improving the cycle stock should increase the synchronization between the supply and the demand which de-emphasizing the safety stock Cycle stock refers to the portion of inventory that is regularly used and replenished as part of the normal business Improving cycle stock management can indeed contribute to better synchronization between supply and demand, which in turn can lead to a reduction in the need for safety stock. By optimizing cycle stock levels and aligning them more closely with actual demand patterns, organizations can reduce the variability and uncertainty in their inventory requirements. When supply and demand are better synchronized, there is less likelihood of stockouts or excess inventory buildup, which are common reasons for holding safety stock. Therefore, improvements in cycle stock management can indirectly lead to a de-emphasis of safety stock throughout the supply chain.

I think answer is D