At full muscle contraction, the Z-lines attached to thin filaments are almost touching

A-band

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I-band

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Actin fibres

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H-zone

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Solution

The correct option is B A-band
As shown in the diagram, as the myofibril contracts, the actin filaments are pulled by myosin filaments to the center, which is explained by the sliding filament theory.
So, when the muscle is fully contracted, the I band almost disappears and Z line comes to lie close, touching the A band.
So, the correct option is 'A-band'.

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