The correct answer is D) Nylon. Nylon is the best type of line to withstand sudden shock loads compared to the other options. Nylon has high elasticity and shock-absorbing properties, which allow it to stretch and absorb the energy from sudden impacts or loads without breaking. This makes nylon the superior choice for applications where the line may be subjected to unexpected, high-impact forces, such as mooring or towing operations. In contrast, manila, polypropylene, and dacron lines are less elastic and more prone to failure under sudden shock loads. The other options would be more suitable for general-purpose applications where shock resistance is less critical.