Which type of fastening tool is powered by compressed air?

A pneumatic tool is specifically designed to operate using compressed air, making it a distinct category of fastening tools. These tools utilize air pressure to create motion and perform tasks such as driving fasteners, operating machines, or tools with a high power-to-weight ratio. Pneumatic tools are widely used in various industries due to their efficiency and ability to deliver a consistent level of force without the added weight of batteries or electric cords.

The other options represent different types of fastening tools. A wrench, for example, is typically operated manually and does not involve any powered mechanism. Battery-driven tools, while they are powered, rely on electricity from batteries rather than air pressure. A torque wrench is a specific type of wrench used to apply a certain level of torque to fasteners but is not powered by compressed air. Therefore, the correct answer is clearly identified as being a pneumatic tool since it directly correlates with the use of compressed air.