Which one has no charge?

Correct Answer: A. Atoms

The correct answer is: A. Atoms
An atom in its natural state has no overall charge because the number of positively charged protons in the nucleus is equal to the number of negatively charged electrons orbiting it. This balance makes it electrically neutral.
Other options, like molecules (e.g., H₂O), can sometimes have partial charges due to polar bonds, and compounds may also form ions.