The answer is c blending.
The artist is using the appeal of pathos (emotional response). They play on the viewers association of the sky with endlessness, as it is often described as such. Additionally, most people associate the sky with birds which are used as mascots which hold value for freedom, like America's bald eagle. Lastly, people have an involuntary reaction to positive stimulus by smiling.
This is false. Value is one of the seven elements of art and is the range of light to dark in a color. It is used to give depth to an object or show it as flat through the use of color. It is a very important element in art.
I know I should comment but, I dont know how. But what are the answer choices.