How did seurat use proportion in a sunday afternoon on the island of la grande jatte to make some figures appear farther away than others?

a: he made the figures in the foreground look closer than those in the background by making them lighter in value and higher on the canvas

b: to make the figures in the background look farther away, seurat made them lighter in value and lower on the canvas

c: to make the figures in the background look farther away, seurat made them smaller in proportion to the figures in the front