Which type of line is best suited for raising and lowering lightweight materials?

Hand lines are specifically designed for lifting and lowering lightweight materials, making them the most appropriate choice in this context. Hand lines typically consist of a lightweight rope that allows one or two individuals to easily control the movement of items being raised or lowered. They are versatile and can be used in a variety of situations, such as construction, rigging, or recreational activities.

In contrast, throw lines are primarily intended for reaching distances and may not provide the necessary control for precise lifting or lowering. Bull ropes are more associated with tying or securing large animals and are not generally used for raising or lowering materials. Guy wires serve a structural purpose, typically stabilizing poles or towers, rather than being used for lifting or lowering weights. Thus, hand lines stand out as the optimal choice for this particular function.