Explanation:

- Ductility: This is the correct answer. It refers to the ability of metals to be drawn into thin wires without breaking. It's a key property that makes metals useful in electrical wiring and other applications.

- Malleability: This is the ability of metals to be hammered or rolled into thin sheets. It is different from ductility but often confused with it.

- Conductivity: This describes a metal's ability to conduct electricity or heat. While important, it has nothing to do with stretching metals into wires.

- Purification: This refers to the process of removing impurities from a material. It's unrelated to forming wires from metals.