ANS:A - should be friable.

A good abrasive should be friable. Friability refers to the ability of an abrasive material to fracture or break down under pressure during grinding or cutting operations. This property allows the abrasive to continuously expose new sharp cutting edges, ensuring efficient material removal and prolonging the life of the abrasive. Abrasives that are too hard or resistant to breakage may become dull quickly and become less effective in cutting or grinding. Therefore, a good abrasive should be friable to maintain sharp cutting edges and provide consistent performance during abrasive machining processes.