Metals are used in many products because of the characteristic properties that most metals share. Which properties of the metal tungsten make it useful in the thin, glowing filaments of light bulbs?

A light-bulb filament must be drawn into a thin wire, so tungsten’s ductility is useful. It must also get extremely hot without melting, which is why tungsten’s high melting point matters. Its electrical conductivity lets current flow through the filament and make it glow. Therefore, the correct choice is D: tungsten is ductile, has a high melting point, and is electrically conductive.

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