The correct answer is: B. Copper
Copper is a good conductor of heat and electricity. It is a soft, malleable metal that is easily worked into wires and other shapes. Copper is used in a variety of applications, including electrical wiring, plumbing, and roofing.
Cast iron is a hard, brittle alloy of iron and carbon. It is not a good conductor of heat or electricity. Cast iron is used in a variety of applications, including cookware, engine blocks, and railroad tracks.
Carbon is a non-metallic element that is found in all living things. It is also found in coal, diamonds, and graphite. Carbon is a good conductor of heat, but it is not a good conductor of electricity.
Tungsten is a hard, brittle metal that is used in a variety of applications, including light bulbs, X-ray tubes, and spark plugs. Tungsten is a good conductor of heat and electricity.