The primary advantage of Replenishment Planning (A) is ensuring optimal inventory levels by predicting demand and adjusting supply plans accordingly. It uses demand signals-e.g., a forecast of 500 units for next month-to trigger timely replenishments, avoiding overstock (costly) or stockouts (lost sales). Option B is incorrect-static levels defy dynamic demand; Replenishment Planning adapts to fluctuations. Option C is false-demand forecasting is its foundation. Option D is unrelated-payment cycles are a financial process. For instance, if demand spikes unexpectedly, it recalibrates orders, saving costs and maintaining service levels, a key operational benefit.