A neutron hasA. positive chargeB. negative chargeC. no chargeD. all of the above

The correct answer is C. no charge.

Explanation:
A neutron is a subatomic particle found in the nucleus of an atom along with protons. Neutrons have no electric charge, which means they are neutral. This lack of charge is in contrast to protons, which have a positive charge, and electrons, which have a negative charge.

Option A (positive charge): This is incorrect because positive charge is a property of protons.
Option B (negative charge): This is incorrect because negative charge is a property of electrons.
Option C (no charge): This is correct as neutrons are electrically neutral particles.
Option D (all of the above): This is incorrect because a neutron cannot have all types of charges simultaneously.
Therefore, the neutron has no charge, making option C the right choice.