What type of line is characterized by being lightweight and having low water absorption?

The correct response is characterized by its lightweight nature and low water absorption properties, making it particularly suitable for marine applications. Polypropylene lines are commonly used in boating because they float and do not absorb water. This property ensures that they remain lightweight, making them easier to handle, and minimizes the risk of waterlogging, which can add unnecessary weight and impact performance.

In contrast, options like manila, nylon, and Dacron have different attributes. Manila lines, made from natural fibers, absorb water and become heavier when wet. Nylon is strong and elastic, but it can absorb water as well, which might reduce its effectiveness in certain conditions. Dacron, although a strong synthetic fiber, may not possess the low absorption traits that polypropylene has. Thus, the lightweight and low water absorption characteristics of polypropylene make it the most suitable answer for this question regarding lines used in boating.