Hay who had pad let??

Most flexible painting medium, used to create both thin, polished layers and thick, gestural brushstrokes

Artists best achieve contrast in a composition by: a. drawing with realism b. shading a drawing with dark and light values c. using drawing techniques like stippling and hatching d. focusing on line and shape in a drawing

Which does the author mean by " nature had to kindle all the fires, for man by his own effort was unable to produce a spark