Which technician correctly states the best method for leveling high spots in body filler?

The best method for leveling high spots in body filler is using a body file, as stated by Technician A. A body file is specifically designed to smooth out and level imperfections in body filler after it has dried. Its long, flat surface allows for even pressure to be applied across the surface, effectively removing high spots and providing a smooth, even finish. The teeth of the file are cut to ensure that it helps refine the area without overly removing material, which is essential for a successful repair.

While a high-speed grinder, mentioned by Technician B, can be used for shaping and removing material, it may remove too much filler too quickly, leading to an uneven surface or even damage to the underlying material if not used carefully. Given the precision required for leveling body filler, the body file is the preferred tool, making Technician A's method the correct choice.