Photons of Energy $4.20 \mathrm{eV}$ Bombard a Surface, Which Emits Photoelectrons with Kinetic Energies from Photoelectrons

Multiple Choice

Photons of energy $4.20 \mathrm{eV}$ bombard a surface, which emits photoelectrons with kinetic energies from 0 to $1.80 \mathrm{eV}$ . What is the threshold frequency for this surface?

A) $1.35 \times 1014 \mathrm{~Hz}$
B) $5.80 \times 10^{14} \mathrm{~Hz}$
C) $7.74 \times 1015 \mathrm{~Hz}$
D) $7.74 \times 1014 \mathrm{~Hz}$
E) $1.35 \times 10^{15} \mathrm{~Hz}$