Study the following lines:

If this be error and upon me proved, I never writ, nor no man ever loved.

These lines are an example of a/an

Aquatrain.
Bcouplet.
Csestet.
Doctet.

Verified Answer :

Hello, the correct answer is B, this is a couplet. 
A couplet is a stanza containing two lines which rhyme, and conclude a Shakespearean sonnet.