Question

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

Explanation:

A sonnet is a poem with 14 lines and a mixed (or specific) rhyme scheme. A foil is a literary device, a couplet has 2 lines, and a stanza is a group of lines (not defined by 14 lines). So the correct term for a 14 - line poem with a mixed rhyme scheme is sonnet.

Answer:

D. sonnet (assuming the options are labeled A to D with A. foil, B. couplet, C. stanza, D. sonnet)