The correct answer is C. Couplet
Step-by-step explanation:
In poetry, a couplet refers to a stanza with only two verses different to a quatrain that contains four verses, an octet that contains eight verses and a sestet that contains six verses. Additionally, in couplets, the two verses usually rhyme and have the same meter or structure. The lines presented can be classified as a couple because it only contains two verses, the verses rhyme due to the repetition of sounds in "proved" and "loved" and both verses have ten syllables "If/this/be/e/rror/and/u/pon/me/proved" "I/ne/ver/writ,/nor/no/man/e/ver/loved" which shows they also have the same structure or meter.