A) because he is the murderer
B. Jim is revealing to Huck that most people are not what they seem.
I think, I am sorry if I am wrong ;/
Hello. Unfortunately the texts your question refers to are not available and this makes it impossible for me to answer your question properly. However, I will try to help you as best I can.
To discover the message these two works share, you will need to read both texts. This message is the theme, the lesson that the author of the two texts wants to present to the reader. You can find this message by reading the texts and answering the question "What are these texts trying to teach me?"