At first, a painting looks uniformly green to Frances. Looking closer, she realizes that the artist actually varies the color in subtle ways using a variety of tints, tones, and shades. She counts at least a dozen distinct varieties of green. Frances is analyzing which aspect of this painting?

A.
its choice of medium

B.
its use of the Elements of Design

C.
its use of the Principles of Design

D.
its subject matt