Correct option is C
Reaming is the process used to enlarge and finish holes to precise dimensions with a smooth surface finish. It is performed using a tool called a reamer, which removes a small amount of material from the sides of a drilled or bored hole to achieve the desired size and finish.
· Counter boring is the process of enlarging the entrance of a hole to allow the head of a screw or bolt to sit flush with or below the surface.
· Drilling is the process of creating a hole by removing material using a drill bit.
· Knurling is the process of creating a textured pattern on a cylindrical surface for grip or decorative purposes.
Thus, the correct process for enlarging holes to accurate sizes is reaming.
