Creating a terracotta sculpture, in which clay is added to create the final piece, is known as a process

Even though you didn't share the options, I bet I know how to answer this question. But next time check it carefully!
So, I am pretty sure that creating a terracotta sculpture, in which clay is added to create the final piece, is known as an additive process.
I do hope that helps!

Answerrelics;

Diamond or a rectangle or a triangle