Which tool is best used to fasten and unfasten fasteners?

The correct choice indicates that all the tools listed—wrench, pliers, and screwdriver—are capable of fastening and unfastening fasteners, though they may do so in different ways and for different types of fasteners.

A wrench is typically used for bolts and nuts, allowing for a strong grip and the ability to apply significant torque, which is essential for tightening or loosening fasteners that are often subjected to high levels of tension.

Pliers can be used for a variety of fasteners but are particularly handy for gripping and twisting. They can be effective for fasteners that are smaller or have an irregular shape that may not be easily handled with a wrench.

A screwdriver is specifically designed for fastening and unfastening screws. It fits into the screw head, allowing for precise torque application necessary for turning the screw either way to secure or remove it.

Since all these tools serve the purpose of interacting with different types of fasteners effectively, the option stating that all of the above tools can be used for fastening and unfastening is accurate. Each tool has its own specific application depending on the type and size of fastener involved, making a comprehensive understanding of their usage vital for any hands-on tasks.