What principal of design is the best represented in the painting? A. Emphasis
B. Shape
C. Line
D. Movement

Line.

Explanation:

I think Line is best represented. I know it's not emphasis or movement for sure.

"the idea of humanism is mostly adeptly reflected in renaissance art by a focus on the body itself, especially with sculpture, where many detailed portraits of the human body (such as the david) were created."