To create a simple electromagnet, the girl would need a material for the core that is ferromagnetic, which means it can be magnetized. The best option among the choices given is:
Metal rod for a core, copper wire, 12-volt battery.
The metal rod will serve as a core that enhances the magnetic field created by the copper wire when an electric current is passed through it, powered by the 12-volt battery. The other options (plastic, wood, and glass) are not ferromagnetic and would not be effective in creating a strong electromagnet.
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