Concept:A seam ripper is specifically designed for cutting and removing stitches safely.Explanation:• A safety pin and dressmakers pin are for holding or fastening fabric, not for unpicking stitches.• A stiletto is used for making holes or eyelets, not for removing stitches.• A seam ripper has a small hooked blade that slides under stitches to cut them without damaging the fabric.Answer:C. seam ripper.