Bragg's Law for X-Ray Diffraction Is 2d Sin $\theta$ = M $\lambda$

Multiple Choice

Bragg's law for x-ray diffraction is 2d sin $\theta$ = m $\lambda$ , where $\theta$ is the angle between the incident beam and:

A) a reflecting plane of atoms
B) the normal to a reflecting plane of atoms
C) the scattered beam
D) the normal to the scattered beam
E) the refracted beam