Which of the following statements about a sonnet is false ?

A. A sonnet is a poem consisting of 14 lines.
B. A Shakespearean sonnet consists of the rhyme scheme a-b-a-b, c-d-c-d, e-f-ef,g-g.
C. A sonnet is only written in Italian.
D. The last two lines of a sonnet are a rhyming couplet.