There once was a man with odd, talking body parts. The man's arms, hands, and head could speak to each other. One day, the man's right arm said to the left arm."I have an itch. __ Which response best completes the joke with a pun? A. Why don't we trade places? B. What are you looking at? C. Could you please stretch me out? D. Will you please lend me a hand?

This question is a type of joke called a pun, which is a form of word play that exploits multiple meanings of a term, or of similar-sounding words, for an intended humorous or rhetorical effect. These plays on words are often used in jokes and comedy. In this case, the joke is about a man whose body parts can talk to each other. The right arm is saying it has an itch, and the left arm is responding. The punchline should be a pun, a play on words. The options are: A. Why don't we trade places? B. What are you looking at? C. Could you please stretch me out? D. Will you please lend me a hand? The best option that completes the joke with a pun is D. "Will you please lend me a hand?" because it is a play on the phrase "lend a hand" which means to help, and also refers to the hand of the arm that is itchy. The other options do not have this pun element.