The correct answer t this question is C: "My friend Joe, who has a cast on his leg, is going to the arcade with me today." If that becomes incorrect, i am very sorry.
I believe the correct answer is D. humorous and informal.
You can see in the excerpt that the narrator is talking about him/herself in a humorous manner by mentioning his/her eccentricities such as 'mismatched socks' etc. The tone is very light and funny, so A, B, and C would be incorrect answers.
Why he does?
<span>draws attention to the line, perhaps making it seem more important.</span>
I think the answer to your question is semicolon.
