For proper support when turning a long thin piece of work between lathe centers, you should use a __________.

Correct Answer: Option C — steady rest

A steady rest is a lathe accessory used to support long, slender workpieces that would otherwise deflect or vibrate under the pressure of the cutting tool. It clamps onto the lathe bed and provides adjustable contact points to stabilize the work, ensuring precision and safety during the machining process.