C) colored light
I hope this helps you!
Rhythm: A continual flow or sense of movement created by a pattern or repetition of visual units. ... Harmony: The quality of how the visual elements are working together in a composition. It is achieved when all elements have unity and cohesion, giving a sense of completion to an artwork.Harmony. Harmony in art and design is the visually satisfying effect of combining similar, related elements. For instance: adjacent colors on the color wheel, similar shapes etc. Harmony.
So there for C. Similarities would be ur answer
hope this helps
