The H-zone in the skeletal muscle fibre is due to

1. A. The absence of myofibrils in the central portion of A-band
2. B. The central gap between myosin filaments in the A-band
3. C. The central gap between actin filaments extending through myosin filaments in the A-band
4. D. Extension of myosin filaments in the central portion of the A-band

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