Question

a poem with fourteen lines and a mixed rhyme scheme is a
foil
couplet
stanza
sonnet

Explanation:

A sonnet is defined as a poem with fourteen lines and typically has a mixed (or specific structured) rhyme scheme. A foil is a literary device for contrast, a couplet is two lines, and a stanza is a group of lines (not fixed at 14). So the correct term for a 14 - line poem with a mixed rhyme scheme is sonnet.

Answer:

D. sonnet