When required to work in an area where explosive gases may accumulate, you should use hand tools which are __________. -

Correct Answer: Option A — nonferrous

Nonferrous tools, typically made of brass, bronze, or beryllium-copper, are essential in hazardous environments to prevent mechanical sparking. Ferrous metals can produce high-energy sparks upon impact with steel surfaces, potentially igniting flammable vapors. Using non-sparking tools is a fundamental safety requirement for working in fuel-rich or explosive atmospheres.