Final answer:
An electric field and a magnetic field can both act on a moving electron, exerting forces that can affect its motion.
Step-by-step explanation:
The statement is true. Both an electric field and a magnetic field can act on a moving electron. When an electron moves through a magnetic field, it experiences a force perpendicular to both its velocity and the magnetic field direction. This is known as the magnetic force. Additionally, an electric field can exert a force on a charged particle such as an electron. Thus, both electric and magnetic fields can affect the motion of a moving electron.