I would for sure say form because it doesn't look like a flat surface, instead it looks 3-D, but If it is multiple choice then I say do C,D, and E.
Here is some advice tho, this question seems like an opinion question, soo, that means that you pick one that stands out to you and escribe why you think so in a descriptive way... if that is not the case then go ahead and use whatever i gave you. Just in case you may want to add a little more to the bolded answer I gave you, just to be professional, in case you do want to add more here is the defintion of form in case you need it
In addition to form, they include line, shape, value, color, texture, and space. As an Element of Art, form connotes something that is three-dimensional and encloses volume, having length, width, and height, versus shape, which is two-dimensional, or flat.
If this helps, I would like brainliest, when possible
