Concept:A Shakespearean sonnet is built from three quatrains followed by one couplet.
Explanation:The Shakespearean sonnet has fourteen lines.
These lines are arranged in four stanzas.
The first three stanzas each contain four lines, so they are called quatrains.
The fourth and final stanza contains two lines, so it is called a couplet.
Thus, the third stanza falls among the three quatrains.
Answer:The third stanza of the Shakespearean sonnet is a quatrain.
Correct option: A. quatrain.