Running stitch is simple and easy to remove, making it ideal for temporary sewing or basting.
Step 1: Analyze the options.
- Running stitch — Used for temporary sewing.
- Chain stitch — Decorative stitch.
- Blanket stitch — Used on edges.
- Cross stitch — Embroidery stitch.
Step 2: Conclusion.
Thus running stitch is correct.
Final Answer:
\[
\boxed{(A) \, \text{Running stitch}}
\]