The Best Way to Remove the Black Line Stain on the Lingual

The best way to remove the black line stain on the lingual aspects of both arches is to:

A) Polish with coarse grit pumice using a motor-driven handpiece
B) Use a slim-diameter ultrasonic tip with a straight working end to remove the stain
C) Use a Nabers diamond-coated file (This instrument has a similar design as a Nabers furcation probe and is diamond coated.)
D) Use a universal curet to remove the stain