74. Regarding the use of sandpaper, which of the following statements is correct? (A) The smaller the grit number of the sandpaper, the rougher the surface. (B) The larger the grit number of the sandpaper, the rougher the sanding effect. (C) The grit number of the sandpaper is unrelated to the roughness. (D) The smaller the grit number of the sandpaper, the more suitable it is for the final polishing step.