Which of the following materials is a conductor of electric current? a. a plastic game piece b. a wooden spoon c. a copper penny d. a glass window

ALL materials conduct electric current to some extent.  Some are
much much much much better at it than others, and we call those
conductors.

From this list of choices, the copper penny is the only conductor.
The plastic, the wood, and the glass conduct so poorly that they
seem to be almost perfect insulators.