What is macbeth’s reaction to the witches’ prophecy of his future?

He is excited at the prospect of becoming king but also fearful about what role he will have to play in making it happen.

Explanation:

At first, it doesn't seem that he cared much about Banquo having heard the prophecy. Banquo was his best friend after all, but one he realized that he would actually be a king, he became so happy that he forgot the fact that he had to kill the current king. Once he thought about it, he was quite scared.

yes, they are. i think.