What is a couplet, in the context of a Shakespearean sonnet?

A Shakespearean sonnet has 14 lines, with three quatrains followed by a rhyming couplet at the end. A couplet is therefore the final two lines, which rhyme with each other. Choice B is too broad: two rhyming lines elsewhere in the poem are not necessarily the sonnet’s concluding couplet.

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