Visible Light from an Ordinary Source Such as a Sodium

Multiple Choice

Visible light from an ordinary source such as a sodium lamp can be used to produce interference effects that demonstrate the wave nature of light,provided that

A) the light beam from the single source is split into two (or more) beams that have a constant phase relationship to one another.
B) the light is polarized.
C) the light is not polarized.
D) Interference effects cannot be demonstrated with ordinary light sources.
E) None of these conditions are satisfied.