In preparing the surface of a metal for application of primers and finish coats, which of the listed hand tools is appropriate for surfaces with significant pitting?

Correct Answer: Option C — Wire brush

A wire brush is the most effective hand tool for cleaning pitted metal surfaces. Its bristles can reach into the depths of pits to remove rust and loose scale that a scraper or sandpaper would miss, ensuring a clean, sound surface for the application of protective primers.