Which stitch should lie flat and interlock at the corner of each stitch?

• A. Zig Zag Stitch
• B. Straight Stitch
• C. Bastestitching
• D. Tension

Answer: (A)

The key idea is how a stitch behaves at edges and corners. A zigzag stitch moves side to side as it sews, which lets the thread wrap over the edge and interlock across both sides of the fabric. That wrapping helps the edge lie flat at each corner and protects it from fraying, giving a neat, smooth finish. A straight stitch runs in a single line and can pull or pucker at corners, without interlocking over the edge. A basted stitch is meant for temporary holding, not finishing edges. Tension is a machine setting that affects stitch tightness, not a stitch type, so it doesn’t provide the edge finish described.