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a
Z membranes move away from each other; I bands are reduced in length
b
Z membranes are brought closer; A bands are reduced in length
c
M lines are brought closer; A bands are reduced in length
d
Z membranes are brought closer; I bands are reduced in length
answer is D.
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Detailed Solution
During muscle contraction, cross-bridges pull the attached actin filaments towards the centre of A band. The Z lines attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere. the I bands get reduced, whereas the A bands retain the length.