Question

when a balloon is rubbed on hair, the balloon becomes: magnetized, positively charged, electrically neutral, negatively charged

Explanation:

When a balloon is rubbed on hair, electrons are transferred from the hair to the balloon. Since electrons have a negative charge, gaining electrons makes the balloon negatively charged. Magnetization is related to magnetic properties (not electric charging), a positively charged object would lose electrons, and electrically neutral means no net charge (which is not the case here as charge transfer occurs).

Answer:

Negatively charged