Concept:Cathode rays are a stream of electrons, whereas the other listed radiations are electromagnetic waves.
Explanation:Radiations that are streams of electrons are known as cathode rays.
Cathode rays are made of negatively charged particles called electrons.
They are emitted from the cathode in a discharge tube at low pressure.
These rays can be deflected by electric and magnetic fields, which proves they are charged particles.
On the other hand, Gamma rays, X-rays, and radio waves are all electromagnetic radiations.
Electromagnetic radiations travel as waves and have no electric charge.
Therefore, cathode rays are the only option that fits the description of a stream of electrons.
Answer:C. Cathode rays