Answer: In the context of a Shakespearean sonnet, a couplet represents the final two lines (A).
Step-by-step explanation:
In poetry, a couplet is a pair of lines that typically rhyme and have the same length. Sometimes, poets write the whole poem in couplet form. However, Shakespeare often used rhyming couplets at the end of his sonnets, to make the ending more effective. One such example is a couplet from his Sonnet 81:
"You still shall live, such virtue hath my pen,
Where breath most breathes, even in the mouths of men."