Final answer:
The bowline knot is the best choice when a closed loop is needed because it forms a secure loop that doesn't slip or bind under strain.
Step-by-step explanation:
The best choice to use when a closed loop is needed is the bowline knot.
The bowline knot forms a secure loop that doesn't slip or bind under strain, making it ideal for creating a loop that needs to remain closed. It is commonly used in sailing, rock climbing, and other activities where a strong and reliable loop is required.
To tie a bowline knot, start by creating a small loop in the rope near the end. Then, pass the end of the rope through the loop. Wrap the end behind the main line and pass it back through the loop. Finally, tighten the knot by pulling the end and the main line in opposite directions.