Final answer:
The mode of transporting products that is limited to liquids and gases is a pipeline.
Step-by-step explanation:
The answer to the question is D) Pipeline. According to the logistics-system design matrix, pipelines are the mode of transportation that is limited to transporting liquids and gases. Pipelines are used to transport substances like oil, natural gas, and other petroleum products. They are considered the most efficient and cost-effective method of transporting these types of materials over long distances.