What does the term “refrain” refer to in a song or poem?
a.
a line that is repeated in multiple stanzas
b.
the use of auditory imagery
c.
the prohibition of rhyme in a stanza or verse
d.
a ballad that tells a sorrowful tale

A. a line that is repeated in multiple stanzas

Explanation:

A "refrain" in a song or peom is a line that is repeated at a regular interval in multiple stanzas. In a song, it is usually called the chorus. Refrain is taken from an old Latin word (refringere) and later a French word (refraindre)  that means "to repeat."

voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.

which one is underlined?