Final answer:
The products displayed on shelves at Walmart are an example of a push system, where products are manufactured and pushed onto the shelves based on forecasts and predictions of consumer demand.
Step-by-step explanation:
The correct answer is D. Push System.
The products displayed on shelves at Walmart are an example of a push system. In a push system, products are manufactured and pushed onto the shelves based on forecasts and predictions of consumer demand. The products are then sold to the customers who come into the store.
This is different from a pull system, where products are manufactured and stocked on the shelves based on actual customer demand. In a pull system, products are only restocked when they are bought by customers, minimizing waste and inventory costs.