The drawing technique of using dots instead of lines called stippling. Using lines instead of dots on the other hand is called hatching. Stippling involves placing individual dots across a surface in a pattern that will be identifiable. Individual dots are used to imply the shape, texture, or shadowing of a subject.
The lightness and darkness in tones and color.
They are really creative and unique
The answer to this question is (1) Edgar Degas; (2) chalk
so D. would be the correct one.