Answer:
- B. Electrons in the balloon move closer to the rod.
Step-by-step explanation:
Electrons are negatively charged particles that surround the nucleus of an atom (when they are not flowing).
Protons are positvely charged particles in the nucleus of the atoms.
Since electrons are the most external particles they are more easily removed and can flow. Protons do not.
A positively charged rod has defficieny of electrons: less electrons than protons.
When a positively charged rod is brought near the surface of a neutrally charged ballon, the positive charge will attract the electrons on the surface of the ballon and will cause them to move closer to the rod. This phenomenun is named charge induction.