A. Negative space is the outline of everything you see in the picture, but only filling in the background color.
B. I found negative space in my cut out by the pink because the pink part was the back paper on which I put the cutout on. I found the negative space in my stool drawing by ignoring the outlines and shading in the empty spaces and the parts that I know weren't any objects.
C. It helps an artist to see in negative space because it trains their eyes to not only focus on the details inside the object, but also the details on the outline of it.
D. Seeing in negative space doesn't enhance the drawing because all you see is the outline of the object without any details.