Light of Wavelength 400 Nm Is Incident on a Certain $\times$

Multiple Choice

Light of wavelength 400 nm is incident on a certain metal.The stopping potential for the emitted electrons is measured to be 1.2 V.What is the work function of this metal? (Planck's constant h = 6.626 $\times$ 10^-34 J · s = 4.136 $\times$ 10^-15 eV s.)

A) 4.3 eV
B) 3.1 eV
C) 1.9 eV
D) 1.2 eV
E) 0.95 eV