What was the main purpose of relief sculptures in mesopotamia?

a. to illustrate books
b. to predict weather patterns
c. to sign important documents
d. to decorate buildings

A relief is a sculptural technique. To create a sculpture in relief is to give the impression that the sculptedmaterial has been raised above the background material. Like many ancient cultures Mesopotamians also produced artistic relief's featuring events, places and people of importance.maybe its d to decorate buildings correct I'm wrong

what is the question? all i see is this statement for something that i can't remember.