Answer:
A,C
Explanation:
A: A has contraction within it which further enhances my point to depict to be a informal tone further informal structure have slang, contraction or else and in this case the subject has contraction
C: C has to be informal as it has the phrase "wanna hang" which further suggest it is informal and of course just by looking we can infer.
The answer to this is clearly A,C
