Correct option is C
The clearance angle in a cutting tool is the angle between the flank of the tool and the workpiece surface. It is designed to prevent the tool from rubbing against the workpiece, thereby reducing friction and wear. A negative clearance angle would result in the tool rubbing against the workpiece, causing excessive heat, tool wear, and poor surface finish. Therefore, a cutting tool can never have its clearance angle as negative. Positive clearance angles are essential to ensure effective cutting action and prolong tool life.
