I think its D) Inhabitants created a hill over time by building newer dwellings on top of older ones.
because the Meaning “fork mound” in Turkish, Catalhuyuk consists of two mounds on either side of an ancient channel of the Çarsamba River on the fertile Konya Plain. . . . ... In doing so, he established Catalhuyuk as an important site for studying the origins of settled farming life and the rise of the first cities.
I hope this helps :3