As we find with most songs, in poetry
a. meanings are hidden in imprecise words.
b. each couplet must rhyme.
c. there's no specific point of view.
d. sound and content have equal weight

The question is asking to choose among the following choices that state the characteristic that we find mostly in most songs and also in poetry, base on my research and further investigation, I would say that the answer would be in letter  B. each couplet must rhyme. I hope you are satisfied with my answer 

Rod zombie is better