Which statement is true about nonsense poems? A. The often focus on the poet's real-life experiences. B. They often reference real-life people and events. C. They often teach an important moral lesson. D. They often contain invented words.

D. They often contain invented (nonsensical) words. A good example of a nonsense poem would be "Jabberwocky" by Lewis Carrol, as it talks about jabberwockys (or jabberwockies?) and jubjub birds, momo wraths, tum tum trees, the frumious bandersnatch, etc