Which principle of design would an artist most likely use to draw viewers to a specific focal point in a piece of artwork?
a. balance
b. emphasis
c. proportion
d. value

D. value.
Many artworks have equal amounts of a,b and c, but there is always a variation in the value, other wise known as tone. A dark shape in the middle of light shapes will be the focus, vise versa.

Aa i believe is the answer to your question