What is a major advantage of applying an initial middle tone with graphite powder?

Correct answer: It provides a quick, even base value over a broad area

The governing concept is broad tonal blocking: graphite powder can be spread with tissue, cotton, or a blending tool to establish a quick, even middle value over a large area. This first layer provides a value map for later dark shading and lifted highlights. Therefore, option C is correct. It does not permanently fix an outline, create highlights alone, or alter the paper’s orientation.