In poetry, a group of three lines that often forms a stanza is known as a
a: cinquain
b: couplet
c: quatrain
d: tercet

D) Tercet.

Explanation: In poetry, a cinquain is a five-line stanza, a couplet is two lines of verse, usually in the same meter and joined by rhyme, that form a unit, a quatrain is a stanza of four lines, especially one having alternate rhymes, and finally, a tercet is a group of three lines that often forms a stanza, so, from the given options, the correct answer is the corresponding to option D: a tercet.

a

explanation: