Contrast: A. is the effect achieved by putting a light color next to a dark color
B. refers to the dullness of a color
C. is the result of mixing primary colors with black or white
D. all of the above

"prior to 1910, these new artists were called neo-impressionists, and they believed that "modern paris" was the proper subject for their paintings."

this is the text provided by the program, disregard other answers, as they are confusing and based on loose knowledge of the subject.   : )