Light of Wavelength 400 Nm Is Incident on a Certain

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 × 10^-34 J · s = 4.136 × 10^-15 eV · s.)

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