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What does constitutional republics mean

Which statement best describes the development of ideas in "sonnet 91"? the quatrains build ideas off of one another, and the couplet conveys a new idea. the quatrains contradict one another, and the couplet resolves their disagreement. the couplet agrees with the idea in the first quatrain but contradicts the others. the couplet builds off of the idea of the third quatrain but contradicts the others.

Missus a. having been sent b. going to send c. having sent d. sending