Concept:A seam ripper is a small sewing tool used for removing stitches.Explanation:• A seam ripper has a small sharp hook that slides under stitches to cut them.• It is commonly used to unpick or remove stitching when a seam is sewn wrongly or needs to be altered.• It is not used for tracing, making eyelets, or piercing belt holes.Answer:B. unpicking stitching.