challenge: What is the result of adding black paint to a color in representational painting?
  
  A. The color becomes darker and its hue remains the same
  B. The color becomes darker and its hue shifts towards the greenish or bluish part of the spectrum
  C. The color becomes darker and its hue shifts towards the reddish part of the spectrum
  D. The color becomes lighter and its hue remains the same
  Answer: 