Which of the following is a component of a plugging kit?

The inclusion of wood plugs as a component of a plugging kit makes them the correct answer. Plugging kits are typically used in various applications to seal leaks or fill holes within a structure. Wood plugs are specifically designed for this purpose as they can expand and fit into drilled holes or gaps, providing a seal that can prevent fluid escape or entry.

On the other hand, while saws can be tools you might use in construction or repair work, they do not serve the function of sealing or plugging, which is the primary purpose of a plugging kit. Hydraulic oil, although useful in many mechanical contexts, does not relate to plugging or sealing gaps. Similarly, a rake is unrelated to any plugging activities, as it is primarily a gardening tool used for gathering leaves and debris. Therefore, wood plugs are essential for performing the specific function that a plugging kit is designed for.