Which of the following will exert a force on a magnet? another magnet a nearby piece of glass a nearby piece of plastic a nearby electric current

The nearby magnet and the electric current both will.

the magnet will attract or repell the other magnet so magnet is one answerthe glass obviously doesn't exert a forcethe ellectric current makes the ellectrons and protons, in the current, allign so that they attract or repell the other magnet