Medium is
a. a way in which an artist creates a work of art.
b. the material of a work of art.
c. the use of more than one tool to create a work of art.
d. made from ground up solids that contain color the color in paint.
select the best answer from the choices provided

Medium is the material of a work of art.

Explanation:

In art, the term "medium" refers to the material used to create an artwork. It can also refer to the type of art, for example, if it's a sculpture, a painting, an installation, etc. There're many different mediums to create an artwork, many times artists mix them: oil, pencil, acrylic painting, watercolor, gauche, pastels, collage using mixed techniques, among many others.

c) from classical art