The correct answer is A. Tungsten.
Tungsten is a chemical element with the symbol W and atomic number 74. It is a silvery-white metal with a high melting point. Tungsten is used in a variety of applications, including electric light bulbs, filaments, and welding rods.
Nichrome is an alloy of nickel and chromium. It is a hard, corrosion-resistant alloy that is used in a variety of applications, including heating elements, electrical resistance wire, and springs.
Graphite is a form of carbon that is made up of carbon atoms arranged in a hexagonal lattice. It is a soft, black material that is used in a variety of applications, including lubricants, electrodes, and lead pencils.
Iron is a chemical element with the symbol Fe and atomic number 26. It is a ferromagnetic metal that is used in a variety of applications, including construction, machinery, and transportation.
Tungsten is the best material for the filament of an electric bulb because it has a high melting point and is resistant to oxidation. Tungsten filaments can withstand the high temperatures inside an electric bulb without melting or breaking down.