Which welding methods are listed as options for welding?

• A. Arc welding
• B. Spot welding
• C. Gas (oxyacetylene) welding
• D. Arc, spot, gas (oxyacetylene)

Answer: (D)

You're being asked to identify all the welding methods that appear among the options. Different welding processes use different heat sources and techniques. Arc welding uses an electric arc to generate heat and join the metal. Spot welding relies on resistance heating as electrodes clamp and pass current to form a localized weld in sheet metal. Gas (oxyacetylene) welding uses a flame from burning gas with oxygen to melt and fuse the metal. The best answer lists all three methods—arc welding, spot welding, and gas welding—because it includes every option that’s mentioned. The other choices name only one or two of the methods, missing others that are also listed in the options.