Concept:
Raw fabric edges tend to fray or ravel when cut. To prevent this, edge finishing stitches are applied using overlock machines.
Step 1: Understand raveling.
Raveling occurs when yarns at cut edges come loose.
Step 2: Understand serging.
Serging (overlocking) involves:
• Enclosing edge with thread loops
• Trimming and binding simultaneously
Step 3: Compare options.
• Serging → prevents raveling
• Safety stitch → for seam reinforcement
• Others → unrelated
Step 4: Final conclusion.
\[
\boxed{\text{Serging}}
\]
Thus,
\[
\boxed{\text{Option (B) is correct.}}
\]
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