B. Refrain
Refrain is a verse, a line, or a group of lines that appears at the end of stanza.
These two lines appear at the end of each stanza in the poem, so the answer is B.
Observation
root/base = observe
suffixe = tion ( meaning =state of being)
I don't think there is a prefix
hope I helped !
They have different tones
A cause-effect relationship<span> is a </span>relationship<span> in which one event (the </span>cause<span>) makes another event happen (the </span>effect<span>).</span>
