A couplet consists of two consecutive lines of poetry that typically rhyme and have the same meter. In "Sonnet 116" by William Shakespeare, the couplet appears at the end of the poem. The lines that form the couplet are:
“If this be error and upon me proved,
I never writ, nor no man ever loved.”
So the correct response is:
“If this be error and upon me proved, I never writ, nor no man ever loved.”