A. Negative space is the area around and between objects. It uses the space around something to show it, without inner detail.
B. In my drawing, I found negative space by replacing the outer portions of the drawing with a mirror of the inner, so that they both reflected the outside of the object.
C. It helps an artist to see in negative space because that makes them aware of the surrounding area of an object, even if they aren't shown. It also helps them display objects without relying on inner details.
D. Seeing in negative space does not enhance drawings, it just is a different way of drawing, a different style.