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The primary purpose of drainage tiles in landscaping is to manage groundwater and prevent waterlogging. This is crucial for maintaining healthy soil conditions for plants. In areas where excess water can lead to saturated soil, drainage tiles help to channel away the surplus water, thus preventing root rot in plants and ensuring that they have the right moisture levels for optimal growth. By efficiently controlling water movement in the soil, drainage tiles enhance the overall environment for landscaping, allowing for better plant health and growth.

The other options focus on aspects that are not the main function of drainage tiles. While enhancing aesthetic appeal is important in landscaping, it does not pertain to the role of drainage tiles. Similarly, increasing soil fertility is influenced by other factors like organic matter and nutrients rather than a drainage system. Providing a foundation for structures is a different concern and typically relates to concrete footings or deep foundations rather than landscaping drainage solutions. Hence, option B remains the correct choice due to its direct relation to the functional role of drainage tiles.