Answer:
C. A play about a deaf character includes jokes that are funnier in
sign language, so audience members who don't know sign
language are left out.
Explanation:
Irony is when something that happens is not what is expected. The deaf character is meaning to make funnier jokes in sign language, but lots of people don't know sign language, so they don't understand his jokes, which is not what he expected. The other answers are sarcasm or are literal, not ironic.