Dynamic rope is designed to:

Dynamic rope is specifically engineered to stretch under load, which allows it to absorb the energy generated when a climber falls. This characteristic of stretching helps to reduce the impact forces exerted on the climber and their gear, enhancing safety during climbing or rescue operations. The ability to stretch is essential in dynamic situations, as it minimizes the risk of injury by dissipating energy rather than allowing for a sudden, jarring stop.

The other options, while related to rope performance, do not accurately describe the primary function of dynamic rope. For instance, while some ropes may have water-resistant properties or coatings, they are not primarily designed to absorb water. Similarly, they may have characteristics that help prevent knotting or enhance abrasion resistance, but these features are secondary to the key function of energy absorption through stretching. Therefore, the characteristic of stretching when loaded is what primarily distinguishes dynamic rope from static rope and makes it essential for safety in climbing and firefighting applications.