Kinetic energy of emitted electrons

A metal surface irradiated by light of a certain frequency undergoes photoelectric emission.

Which of these best represents the average energy $\left(E_{\text{avg}}\right)$‍ spent by a photon in removing an electron from the metal surface?$\begin{array}{rl}& \\ & \end{array}$‍ Note: ${\varphi }_0$‍ is the work function of the metal.