Question: Smooth muscle cells contain
A: actin but not myosin.
B: myosin but not actin.
C: actin and myosin arranged irregularly.
D: actin and myosin arranged in parallel arrays.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. Provide your response in exactly 6 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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