Question

which type of tools are powered by compressed air?
hydraulic
powder-actuated
pneumatic
oscillating

Explanation:

Pneumatic tools are powered by compressed air. Hydraulic tools use liquid (usually oil) under pressure. Powder - actuated tools use explosive charges. Oscillating tools refer to the motion of the tool's blade or bit (back - and - forth small - arc motion) and not the power source.

Answer:

C. Pneumatic