The correct answer is: Gamma rays are emissions that have neither mass nor charge.
Gamma rays are a type of electromagnetic radiation, just like visible light, radio waves, and microwaves. They are produced by the decay of radioactive atoms, and they have a very high energy. Gamma rays are able to pass through most materials, including lead and concrete. They are used in medicine for imaging and treatment, and they are also used in industry and research.
Option A is incorrect because gamma rays have no charge. Option B is correct because gamma rays have neither mass nor charge. Option C is incorrect because gamma rays have no mass. Option D is incorrect because gamma rays have no charge.