Pendentives. I know this from my art history class hope this helps!
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.
This piece is abstract. It is unknown to the eye what exactly it is looking at without an explanation. To many at first glance, this piece may look like a collect paint that has been stroked and blobbed, without careful planning or though, across a canvas. Therefore, there is not a clear subject matter, and no universal decision could be made. There is however content. When you look a this piece is does create feelings, however they may be different for each person who views the piece and for the artist himself.
