Richard used this image to explain techniques for creating depth to his class. Which technique did he use to create depth in this image? overlapping sea shells

A.

color

B.

linear perspective

C.

occlusion

D.

depth of field

the answer is occlusion

Explanation:

the shells overlap each other

answer; i believe that the correct answers are ///train hospital staff on how to use new machinery and design an artificial lung that could be implanted in humans;