When you are talking to someone and you want a certain phrase you said to stand out, you emphasis your words. That is pretty much the same case here. A is incorrect because that is capturing a model of some sort, B is incorrect because that would be an equal blend of all colors together, and D is incorrect because you are not uniting the colors, you want the elements to stand out. Emphasis is achieved usually by using mostly dark colors then a splash of something such as neon pink or yellow.
All colors mean something on an emotional level and they can help add new visual layers to your film. For example: warm colors (such as red, yellow, or orange) wake us up and get us moving while cool colours (such as blue, green, white) have a calming effect on us.
