B. diptych format from the icons of Christianity such as those found in the Byzantine church.
Explanation:
The name of this collection of images is in fact <em>Marilyn Diptych</em>, so you can be certain that B is the correct answer here. The Greek word diptych refers to something consisting of two parts, and was often used in Christian art and churches to refer to a painting in two parts that can close like a book.
Warhol was inspired by this type of art to create Marylin Diptych, which can now be found in the Tate Gallery in the UK.
It looks like it could have been done with different types of mediums. You can tell that the artist tried to make it have more dimension by adding in shadows and highlights. I think the color gives it a good balance though. It looks like it is a piece that as the observer you need to come up with yourself.