A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively.
Kinetic energy of electrons= K1
Kinetic energy of metal ions = K2
Electrons are free to move and metal ions are bounded at their positions and can’t move freely as electrons. Due to thermal energy metal ions are just vibrate due to collision with electrons. When a current is passes through a resistor, because of the free movement the velocity of the electrons is greater than the metal ions.
Velocity of the electrons is grater than the metal ions. So kinetic energy of electrons is greater than the kinetic energy of metal ions.
Thus, option C is the correct option.