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

Correct Answer: Option D — non-sparking

Non-sparking tools, typically made from beryllium-copper or aluminum-bronze alloys, are essential in hazardous areas to prevent mechanical sparks. Ferrous metals can produce high-energy sparks upon impact, which could ignite flammable vapor mixtures. This practice is a fundamental safety requirement for working in fuel-handling or cargo-handling spaces.