The correct answer is <em>"Thermal".</em>
I believe that the answer is C. Hope this Helps:)))
When an electron is accelerated through potential difference then the speed that it attain will be explained by energy conservation
here by energy conservation we can say that
change in kinetic energy of electron = electrostatic potential energy gained through given potential difference
kinetic energy is given as

electrostatic potential energy is given as

now by energy conservation

given that for electron



now by plug in values



So here it is accelerated through potential difference of 2559.4 Volts