Answer: D. An epic poem almost always features a refrain.
Step-by-step explanation:
A refrain is indeed like a chorus in a song because it usually repeats in a poem especially after every stanza which is much like a chorus in a song. Refrains are usually included in ballads such that they are repeated after each stanza as already mentioned. Based on the above, options A. B and C are true.
An epic poem on the other hand, rarely includes refrains. This is because such poems are more like stories that narrate the adventures of famous characters. Repeating lines would not advance the story so refrains are avoided.