This is for art CLASS how is it

Medium is a. the materials used by an artist. b. the aesthetic balance an artist achieves in his/her work of art. c. the relation of one part to another, or of parts to the whole. d. a reproduction of people, places, or things. select the best answer from the choices provided

Explain why a work of art is considered so valuable and who is affected when a work of art is stolen

Why dont early paintings tend to look very realistic