Which One of the Following Statements Provides the Most Convincing

Which one of the following statements provides the most convincing evidence that visible light is a form of electromagnetic radiation?

A) Two light sources can be coherent.
B) Light can be reflected from a surface.
C) Light can be diffracted through an aperture.
D) Light can form a double-slit interference pattern.
E) Light travels through vacuum at the same speed as X-rays.