B. For both mini projects I just looked at all the places where there were no objects. Like with the cut out I looked at the back round for the negative space. For the stool drawing I just looked at where none of the chairs and signs were.
C. If an artist can see the negative space then they can make a picture look mirrored, reflective, upside down, etc. They can understand the picture better.
D. If you can see negative space you can understand the drawing better and be able to see hidden pictures as well if there are any.