How is a white line produced in the impressed-line technique?

Correct answer: By indenting the paper with a blunt pointed tool before applying graphite

The governing idea is subtractive surface control. Before applying graphite, the artist presses a blunt pointed tool into the paper to make a shallow groove without cutting through the sheet. Later, graphite passes over the surface but reaches the recessed line less effectively, so the indentation remains light or white. Thus, option C is correct; burning, painting, or merely rotating an eraser does not create this impressed-line effect.