An electron beam can undergo diffraction by crystals, proving the wave nature of electrons. The potential required for a beam of electrons to be accelerated so that its wavelength becomes equal to $$0.154\ \mathrm{nm}$$ is

A

$$63.5\ \mathrm V$$

B

$$31.75\ \mathrm V$$

C

$$635\ \mathrm V$$

D

$$127\ \mathrm V$$