It’s C but give da crown to Weebthe3rd
Emphasis is the principle of creating a centered interest in an artwork, often achieved by color contrast and by lines that direct the eye to it.
Using this definition, we can see all of the above. Color contrast and lines that lead the viewer's focus to a focal point.
So, it can't be chiaroscuro because there is no obscurity.
It can't be sfumato because there are very few soft tones (lots of contrast)
It can't be primary colors because we see more than just the three primaries.
That leaves complementary colors, which makes sense. The complementary colors put together creates lines that lead our attention.
Answer: b.
Duke Ellington was an early band leader who was also a prolific composer. He was a leader of a jazz orchestra back in the early 20th century until his death in 1974. Apart from being a pianist and leader of this band, he was also a composer who prided himself on many popular compositions he wrote for the band and some other projects.
He invented the camera obscura, the precursor to the pinhole camera, to demonstrate how light can be used to project an image onto a flat surface. Earlier references to the camera obscura have been found in Chinese texts dating to about 400 B.C. and in the writings of Aristotle around 330 B.C.