The answer is AABB because "secure" rhymes with "sure" and "keeps" rhymes with "sleeps". If it were ABAB the ending lines would need to alternate, should it be ABCD all the ending words would be different. If it were ABBA, the first and fourth would rhyme and the second and third would rhyme.
Answer:
was.........................
B is correct answer.
Couplet is a rhyming words from at the end of 2 consecutive lines.
Hope it helped you.
-Charlie
Thanks!