In Davisson-Germer experiment, at acclerating voltage of 54 V, intensity of scattered electrons is maximum at a scattering angle of 50°. The appearance of the peak in a particular direction is due to

• A

  resonance caused by scattered electrons

• B

  destructive interference of electrons scattered from different layeres of atoms of crystal

• C

  constructive interference of electrons scattered from different layers of atoms of crystal

• D

  constructive interference of electrons scattered by same atom of crystal