Shakespeare’s sonnets, including "Sonnet 29,” have which characteristic?

A Shakespearean sonnet has 14 lines arranged as three quatrains (groups of four lines) followed by a couplet (two rhyming lines). Three quatrains make 12 lines, and the couplet brings the total to 14. Therefore, the correct choice is “They all contain three quatrains and a couplet.”

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