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

Correct Answer: Option B — non-ferrous

Non-ferrous tools are required in explosive atmospheres because they do not produce sparks when struck against other metals. Ferrous tools, such as standard steel, can generate sparks upon impact, which could ignite flammable vapors. This is a critical safety practice for working in fuel tanks or pump rooms.