Yellow Light Is Viewed by Reflection from a Thin Vertical $\lambda$

Multiple Choice

Yellow light is viewed by reflection from a thin vertical soap film.Let $\lambda$ be the wavelength of the light within the film.Why is there a large dark space at the top of the film?

A) no light is transmitted through this part of the film
B) the film thickness there is $\lambda$ /4
C) the light reflected from exactly one of the two surfaces undergoes a 180 $\degree$ phase change
D) the film is too thick in this region for thin film formulas to apply
E) the reflected light is in the infrared