Concept:Radiation that is deflected by both electric and magnetic fields must consist of charged particles.
Explanation:Beta rays are streams of fast-moving electrons.
Electrons carry a negative charge.
Charged particles experience a force in both magnetic and electric fields, causing them to be deflected.
Gamma rays, x-rays, and ultraviolet rays are electromagnetic waves.
Electromagnetic waves have no charge, so they are not deflected by electric or magnetic fields.
Therefore, the radiation described is beta rays.
Answer:A. beta rays