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

Correct Answer: Option D — non-ferrous

Non-ferrous hand tools made of materials like brass or beryllium-copper do not produce steel-on-stone or steel-on-steel sparks when struck. This eliminates the ignition source necessary to detonate flammable vapor-air mixtures in hazardous, explosive spaces such as fuel pump rooms or cargo tanks.