Light with a frequency of $7\mathrm{.}5{10}^{14}Hz$ shines on a piece of metal, and electrons with a maximum kinetic energy of $0\mathrm{.}23$ eV are ejected. What is the work function of this metal?

a$)0\mathrm{.}22$ eV

b$)3\mathrm{.}10$ eV

c$)2\mathrm{.}87$ eV

d$)3\mathrm{.}33$ eV

e$)$ None of the above.