Concept:
Lockstitch machines are the most widely used industrial sewing machines. High-speed variants are designed for mass production with optimized motor systems and lubrication.
Step 1: Understand industrial sewing speed.
Modern high-speed lockstitch machines operate at:
• Very high RPM
• Continuous operation
• Automated lubrication
Step 2: Typical speed range.
• Industrial high-speed machines → 6000–8000 stitches per minute
Step 3: Final conclusion.
\[
\boxed{\text{6000–8000 spm}}
\]
Thus,
\[
\boxed{\text{Option (A) is correct.}}
\]
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