Final answer:
The third stanza from the excerpt of Dr. Seuss's The Cat in the Hat forms a couplet, as it comprises two successive rhyming lines.
Step-by-step explanation:
The correct answer to which stanza forms a couplet is c:
Stanza 3. A couplet is a pair of successive rhyming lines, typically of the same length, that usually form a complete thought. In Dr. Seuss's The Cat in the Hat, the third stanza presents two lines that rhyme (you and you), forming a couplet.
In contrast, the first and second stanzas do not form couplets because they consist of more than two lines without the consistent end rhyme that defines a couplet. 'Well... what would YOU do If your mother asked you?' A couplet is a pair of rhyming lines in a poem. In this case, both lines end with the words 'do' and 'you', creating a rhyming couplet.