What technique does da vinci use in the last supper to create depth?

a. chiaroscuro
b. sfumato
c. perspective
d. vanishing point

It's actually C, I know this was already said but its easier to see outside of a comment. :p

C. perspective

Explanation:

A perspective is created using a group of parallel lines that converges to a vanishing point. In a nutshell, these lines make the elements on the canvas be seem small at distance, and gradually grow up when they are closer to the viewer. When we look at a painting that uses this technique, the elements in the canvas are not flat, it seems that they can jump out the art.