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

In the context of a Shakespearean sonnet, a couplet represents the final two lines (A).

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."

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.