Which type of hose is designed to seal when wet, enhancing its effectiveness?

The correct choice is based on the characteristics of the hose types mentioned, particularly focusing on the way they behave when exposed to water. Unlined hoses are specifically designed to expand and seal upon getting wet, creating a more effective barrier against the flow of water. This sealing ability enhances their performance in preventing leaks and ensuring that water reaches its intended destination efficiently.

In contrast, woven hoses do not have the same sealing properties when wet; their design is more focused on durability and flexibility for other applications. Synthetic hoses, while durable and resistant against various conditions, do not specifically highlight a sealing feature upon wetting. Flexible hoses, on the other hand, are designed for ease of handling and movement but do not provide the same sealing capability as unlined hoses when they come in contact with water. Thus, unlined hoses stand out for their unique function that enhances effectiveness in various water application scenarios.