What is the significance of studying art and literature together?
they complement one another so it allows the audience to more fully engage with the pieces when the background and connections are understood.
every piece of literature has a piece of art that corresponds with it. we must recognize those connections.
there isn't a significant relationship between art and literature. people just make that up.
art is a form of expression and literature is a form of expression. so one without the other is not valid.

I would say that the best answer is A. C is definitely not the answer because of course, there is a relationship between art and literature. 

Studying literature involves reading, thinking, interpreting, discussing, and writing. Studying art is analyzing and critiquing the artwork, as well as learning about the history of art. Putting both literature and art together creates a better understanding of the artwork and a more in-depth discussion about the artwork itself. 

(I apologize for the late reply. Hopefully this answer is helpful to you though.)